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vjailbreak/docs/guides/how-to/networking-101/index.html
T
OmkarDeshpande7andClaude Sonnet 5 3fc874dd22 Fix docs base path after repo rename to vjailbreak
Rebuilt Astro site with BASE=vjailbreak; old build had base baked
as vjailbreak-docs, causing all CSS/JS asset URLs to 404 on GH Pages.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
2026-09-16 12:23:48 +05:30

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<span class="astro-3ii7xxms">Getting Started</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/introduction/prerequisites/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Prerequisites</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/introduction/faq/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">FAQ</span> </a> </li> </ul> </details> </li><li class="astro-3ii7xxms"> <details open class="astro-3ii7xxms"> <sl-sidebar-restore data-index="1"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"> <span class="large astro-3ii7xxms">Concepts</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"><path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 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class="astro-3ii7xxms">Migration Options</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/concepts/cluster-conversion/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Cluster Conversion</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/concepts/storage-accelerated-copy/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Storage Accelerated Copy</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/concepts/vjailbreak-accelerated-copy/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">vJailbreak Accelerated Copy</span> </a> </li> </ul> </details> </li><li class="astro-3ii7xxms"> <details open class="astro-3ii7xxms"> <sl-sidebar-restore data-index="2"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"> <span class="large astro-3ii7xxms">Architecture</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms 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24" fill="currentColor" style="--sl-icon-size: 1.25rem;"><path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z"/></svg> </summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/cluster-conversion/cluster-conversion/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Cluster Conversion</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/cluster-conversion/maas-enablement/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Add ESXi to MAAS</span> </a> </li> </ul> </details> </li><li class="astro-3ii7xxms"> <details open class="astro-3ii7xxms"> <sl-sidebar-restore data-index="6"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"> <span class="large astro-3ii7xxms">How-to</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms 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</a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/networking-101/" aria-current="page" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">One-Stop Migration Networking</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/ntp_timezone/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Configure Time Zone and NTP Servers</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/perform_admin_cutover/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Perform Admin Cutover</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/profiles/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Profiles</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/retry_failed_migration/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Retry a Failed Migration</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/scaling/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Scale vJailbreak</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/stream_logs/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Stream Logs</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/upgrade_vjailbreak/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Upgrade vJailbreak</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/virtio_doc/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Inject VirtIO Windows Driver</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/vjailbreak_settings/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Use vJailbreak Settings</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/vtpm_migration/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Virtual Trusted Platform Module (vTPM) VM Migration</span> </a> </li><li class="astro-3ii7xxms"> <a href="/vjailbreak/guides/how-to/windows-ldm-migration/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Windows Dynamic Disk (LDM) Migration</span> </a> </li> </ul> </details> </li><li class="astro-3ii7xxms"> <details open class="astro-3ii7xxms"> <sl-sidebar-restore data-index="7"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"> <span class="large astro-3ii7xxms">Troubleshooting</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"><path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 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print:hidden astro-67yu43on"> <div class="right-sidebar astro-67yu43on"> <div class="lg:sl-hidden astro-pb3aqygn"><mobile-starlight-toc data-min-h="2" data-max-h="3" class="astro-doynk5tl"><nav aria-labelledby="starlight__on-this-page--mobile" class="astro-doynk5tl"><details id="starlight__mobile-toc" class="astro-doynk5tl"><summary id="starlight__on-this-page--mobile" class="sl-flex astro-doynk5tl"><div class="toggle sl-flex astro-doynk5tl">On this page<svg aria-hidden="true" class="caret astro-doynk5tl astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1rem;"><path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z"/></svg> </div><span class="display-current astro-doynk5tl"></span></summary><div class="dropdown astro-doynk5tl"><ul class="isMobile astro-g2bywc46" style="--depth: 0;"> <li class="astro-g2bywc46" style="--depth: 0;"> <a href="#_top" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Overview</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#advanced-options-for-migration" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Advanced options for migration</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#table-of-scenarios" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Table of scenarios</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#a--keep-the-same-ip-and-the-same-mac" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">A — Keep the same IP and the same MAC</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#b--assign-a-specific-new-ip-address" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">B — Assign a specific new IP address</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#c--force-everything-onto-dhcp" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">C — Force everything onto DHCP</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#d--the-destination-is-on-a-different-subnet" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">D — The destination is on a different subnet</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#e--prefer-the-same-ip-but-accept-dhcp-rather-than-fail" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">E — Prefer the same IP, but accept DHCP rather than fail</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#f--the-destination-is-an-l2-only-network" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">F — The destination is an L2-only network</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#g--keep-the-ip-but-let-openstack-pick-a-new-mac" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">G — Keep the IP but let OpenStack pick a new MAC</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#h--the-source-vm-is-powered-off" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">H — The source VM is powered off</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#i--create-the-port-with-no-address-at-all" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">I — Create the port with no address at all</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#j--preserve-ip-and-mac-but-persist-network-is-off" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">J — Preserve IP and MAC, but Persist Network is off</span> </a> </li> </ul> </div></details></nav></mobile-starlight-toc><script type="module" src="/vjailbreak/_astro/MobileTableOfContents.astro_astro_type_script_index_0_lang.C181hMzK.js"></script></div><div class="right-sidebar-panel sl-hidden lg:sl-block astro-pb3aqygn"><div class="sl-container astro-pb3aqygn"><starlight-toc data-min-h="2" data-max-h="3"><nav aria-labelledby="starlight__on-this-page"><h2 id="starlight__on-this-page">On this page</h2><ul class="astro-g2bywc46" style="--depth: 0;"> <li class="astro-g2bywc46" style="--depth: 0;"> <a href="#_top" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Overview</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#advanced-options-for-migration" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Advanced options for migration</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#table-of-scenarios" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Table of scenarios</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#a--keep-the-same-ip-and-the-same-mac" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">A — Keep the same IP and the same MAC</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#b--assign-a-specific-new-ip-address" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">B — Assign a specific new IP address</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#c--force-everything-onto-dhcp" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">C — Force everything onto DHCP</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#d--the-destination-is-on-a-different-subnet" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">D — The destination is on a different subnet</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#e--prefer-the-same-ip-but-accept-dhcp-rather-than-fail" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">E — Prefer the same IP, but accept DHCP rather than fail</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#f--the-destination-is-an-l2-only-network" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">F — The destination is an L2-only network</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#g--keep-the-ip-but-let-openstack-pick-a-new-mac" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">G — Keep the IP but let OpenStack pick a new MAC</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#h--the-source-vm-is-powered-off" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">H — The source VM is powered off</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#i--create-the-port-with-no-address-at-all" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">I — Create the port with no address at all</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#j--preserve-ip-and-mac-but-persist-network-is-off" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">J — Preserve IP and MAC, but Persist Network is off</span> </a> </li> </ul> </nav></starlight-toc><script type="module" src="/vjailbreak/_astro/TableOfContents.astro_astro_type_script_index_0_lang.CKWWgpjV.js"></script></div></div> </div> </aside> <div class="main-pane astro-67yu43on"> <main data-pagefind-body class="astro-bguv2lll" lang="en" dir="ltr"> <div class="content-panel astro-7nkwcw3z"> <div class="sl-container astro-7nkwcw3z"> <h1 id="_top" class="astro-j6tvhyss">One-Stop Migration Networking</h1> </div> </div> <div class="content-panel astro-7nkwcw3z"> <div class="sl-container astro-7nkwcw3z"> <div class="sl-markdown-content"> <p>Network settings are the most common cause of failed or surprising migrations. This guide is organized by situation: find the scenario that matches yours, apply the settings, and check the expected outcome before you migrate.</p>
<p>Every scenario reports two separate outcomes:</p>
<ul>
<li><strong>The OpenStack port</strong> — the address and MAC that OpenStack assigns to the network port.</li>
<li><strong>Inside the guest</strong> — what the migrated VM’s own network configuration looks like on first boot.</li>
</ul>
<p>These two can differ. A preserved IP address on the port does not always mean the guest is statically configured to match it.</p>
<aside aria-label="Note" class="starlight-aside starlight-aside--note"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 11C11.7348 11 11.4804 11.1054 11.2929 11.2929C11.1054 11.4804 11 11.7348 11 12V16C11 16.2652 11.1054 16.5196 11.2929 16.7071C11.4804 16.8946 11.7348 17 12 17C12.2652 17 12.5196 16.8946 12.7071 16.7071C12.8946 16.5196 13 16.2652 13 16V12C13 11.7348 12.8946 11.4804 12.7071 11.2929C12.5196 11.1054 12.2652 11 12 11ZM12.38 7.08C12.1365 6.97998 11.8635 6.97998 11.62 7.08C11.4973 7.12759 11.3851 7.19896 11.29 7.29C11.2017 7.3872 11.1306 7.49882 11.08 7.62C11.024 7.73868 10.9966 7.86882 11 8C10.9992 8.13161 11.0245 8.26207 11.0742 8.38391C11.124 8.50574 11.1973 8.61656 11.29 8.71C11.3872 8.79833 11.4988 8.86936 11.62 8.92C11.7715 8.98224 11.936 9.00632 12.099 8.99011C12.2619 8.97391 12.4184 8.91792 12.5547 8.82707C12.691 8.73622 12.8029 8.61328 12.8805 8.46907C12.9582 8.32486 12.9992 8.16378 13 8C12.9963 7.73523 12.8927 7.48163 12.71 7.29C12.6149 7.19896 12.5028 7.12759 12.38 7.08ZM12 2C10.0222 2 8.08879 2.58649 6.4443 3.6853C4.79981 4.78412 3.51809 6.3459 2.76121 8.17317C2.00433 10.0004 1.8063 12.0111 2.19215 13.9509C2.578 15.8907 3.53041 17.6725 4.92894 19.0711C6.32746 20.4696 8.10929 21.422 10.0491 21.8079C11.9889 22.1937 13.9996 21.9957 15.8268 21.2388C17.6541 20.4819 19.2159 19.2002 20.3147 17.5557C21.4135 15.9112 22 13.9778 22 12C22 10.6868 21.7413 9.38642 21.2388 8.17317C20.7363 6.95991 19.9997 5.85752 19.0711 4.92893C18.1425 4.00035 17.0401 3.26375 15.8268 2.7612C14.6136 2.25866 13.3132 2 12 2ZM12 20C10.4178 20 8.87104 19.5308 7.55544 18.6518C6.23985 17.7727 5.21447 16.5233 4.60897 15.0615C4.00347 13.5997 3.84504 11.9911 4.15372 10.4393C4.4624 8.88743 5.22433 7.46197 6.34315 6.34315C7.46197 5.22433 8.88743 4.4624 10.4393 4.15372C11.9911 3.84504 13.5997 4.00346 15.0615 4.60896C16.5233 5.21447 17.7727 6.23984 18.6518 7.55544C19.5308 8.87103 20 10.4177 20 12C20 14.1217 19.1572 16.1566 17.6569 17.6569C16.1566 19.1571 14.1217 20 12 20Z"></path></svg>Note</p><div class="starlight-aside__content"><p>For the underlying mechanism behind interface-name persistence and per-OS guest behavior, see <a href="../../../concepts/network-persistence/">Network Persistence</a>.</p></div></aside>
<h2 id="advanced-options-for-migration">Advanced options for migration</h2>
<table><thead><tr><th>Setting</th><th>What it controls</th></tr></thead><tbody><tr><td><strong>Preserve IP</strong></td><td>Carry the discovered source IP onto the OpenStack port.</td></tr><tr><td><strong>IP address box</strong></td><td>Leave as-is (discovered IP), type one IPv4 address, or leave empty.</td></tr><tr><td><strong>Preserve MAC</strong></td><td>Carry the source MAC, or let OpenStack generate a new one.</td></tr><tr><td><strong>Fallback to DHCP</strong></td><td>On = accept an OpenStack-assigned address rather than fail. Off = stop the migration on conflict or mismatch.</td></tr><tr><td><strong>Persist source network interfaces</strong></td><td>Restore the original interface names inside the guest. Only available when Preserve IP is on.</td></tr></tbody></table>
<h2 id="table-of-scenarios">Table of scenarios</h2>
<p>Find the situation that matches yours, read across the row for the settings to apply, then follow the link to the detailed block — expected outcome, port and guest behavior, and the caveats.</p>
<table><thead><tr><th>Scenario</th><th>Preserve IP</th><th>IP address box</th><th>Preserve MAC</th><th>Fallback to DHCP</th><th>Persist source network interfaces</th><th>Details</th></tr></thead><tbody><tr><td><strong>A</strong> — Same subnet: keep the exact IP and MAC, fail if the address is taken</td><td><strong>On</strong></td><td>Leave as-is</td><td><strong>On</strong></td><td>Off</td><td><strong>On</strong></td><td><a href="#a--keep-the-same-ip-and-the-same-mac">Scenario A →</a></td></tr><tr><td><strong>B</strong> — Specific new IP</td><td>Off</td><td>Type one IPv4 address</td><td>Either</td><td>Off, or on if a DHCP address is acceptable</td><td>Unavailable</td><td><a href="#b--assign-a-specific-new-ip-address">Scenario B →</a></td></tr><tr><td><strong>C</strong> — Everything on DHCP</td><td>Off on every NIC</td><td>Empty</td><td>Either</td><td><strong>On</strong> — required</td><td>Unavailable</td><td><a href="#c--force-everything-onto-dhcp">Scenario C →</a></td></tr><tr><td><strong>D</strong> — Different subnet</td><td>Off</td><td>Empty, or an address valid in the new subnet</td><td>Either</td><td><strong>On</strong> — required</td><td>Unavailable</td><td><a href="#d--the-destination-is-on-a-different-subnet">Scenario D →</a></td></tr><tr><td><strong>E</strong> — Same subnet, bulk move: prefer the IP but accept DHCP rather than fail</td><td><strong>On</strong></td><td>Leave as-is</td><td><strong>On</strong></td><td><strong>On</strong></td><td><strong>On</strong></td><td><a href="#e--prefer-the-same-ip-but-accept-dhcp-rather-than-fail">Scenario E →</a></td></tr><tr><td><strong>F</strong> — L2-only network</td><td>No effect on the port</td><td>Ignored</td><td>Either — on to keep the MAC</td><td>Greyed out</td><td>Your choice</td><td><a href="#f--the-destination-is-an-l2-only-network">Scenario F →</a></td></tr><tr><td><strong>G</strong> — Same IP, new MAC</td><td><strong>On</strong></td><td>Leave as-is</td><td>Off</td><td>Your choice</td><td>Your choice</td><td><a href="#g--keep-the-ip-but-let-openstack-pick-a-new-mac">Scenario G →</a></td></tr><tr><td><strong>H</strong> — Source VM powered off</td><td>Forced off (greyed out)</td><td>Type an address, or empty for DHCP</td><td>Either — usually on</td><td>On if the address box is empty</td><td>Unavailable</td><td><a href="#h--the-source-vm-is-powered-off">Scenario H →</a></td></tr><tr><td><strong>I</strong> — Port with no address</td><td>Off</td><td>Empty</td><td>Either</td><td>Off</td><td>Unavailable</td><td><a href="#i--create-the-port-with-no-address-at-all">Scenario I →</a></td></tr><tr><td><strong>J</strong> — Preserve IP and MAC, Persist Network off</td><td><strong>On</strong></td><td>Leave as-is</td><td><strong>On</strong></td><td>Your choice</td><td>Off</td><td><a href="#j--preserve-ip-and-mac-but-persist-network-is-off">Scenario J →</a></td></tr></tbody></table>
<p><strong>Reading the table</strong></p>
<ul>
<li><strong>Either</strong> / <strong>Your choice</strong> — the setting does not change the outcome the scenario describes.</li>
<li><strong>Unavailable</strong> — the UI disables <strong>Persist source network interfaces</strong> whenever Preserve IP is off.</li>
<li><strong>Greyed out</strong> — the UI disables the setting for this scenario; you cannot change it.</li>
<li><strong>Leave as-is</strong> — do not edit the box; it already shows the discovered IP.</li>
</ul>
<aside aria-label="Caution" class="starlight-aside starlight-aside--caution"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 16C11.8022 16 11.6089 16.0587 11.4444 16.1686C11.28 16.2784 11.1518 16.4346 11.0761 16.6173C11.0004 16.8001 10.9806 17.0011 11.0192 17.1951C11.0578 17.3891 11.153 17.5673 11.2929 17.7071C11.4327 17.847 11.6109 17.9422 11.8049 17.9808C11.9989 18.0194 12.2 17.9996 12.3827 17.9239C12.5654 17.8482 12.7216 17.72 12.8315 17.5556C12.9413 17.3911 13 17.1978 13 17C13 16.7348 12.8946 16.4805 12.7071 16.2929C12.5196 16.1054 12.2652 16 12 16ZM22.67 17.47L14.62 3.47003C14.3598 3.00354 13.9798 2.61498 13.5192 2.3445C13.0586 2.07401 12.5341 1.9314 12 1.9314C11.4659 1.9314 10.9414 2.07401 10.4808 2.3445C10.0202 2.61498 9.64019 3.00354 9.38 3.47003L1.38 17.47C1.11079 17.924 0.966141 18.441 0.960643 18.9688C0.955144 19.4966 1.089 20.0166 1.34868 20.4761C1.60837 20.9356 1.9847 21.3185 2.43968 21.5861C2.89466 21.8536 3.41218 21.9964 3.94 22H20.06C20.5921 22.0053 21.1159 21.8689 21.5779 21.6049C22.0399 21.341 22.4234 20.9589 22.689 20.4978C22.9546 20.0368 23.0928 19.5134 23.0895 18.9814C23.0862 18.4493 22.9414 17.9277 22.67 17.47ZM20.94 19.47C20.8523 19.626 20.7245 19.7556 20.5697 19.8453C20.4149 19.935 20.2389 19.9815 20.06 19.98H3.94C3.76111 19.9815 3.5851 19.935 3.43032 19.8453C3.27553 19.7556 3.14765 19.626 3.06 19.47C2.97223 19.318 2.92602 19.1456 2.92602 18.97C2.92602 18.7945 2.97223 18.622 3.06 18.47L11.06 4.47003C11.1439 4.30623 11.2714 4.16876 11.4284 4.07277C11.5855 3.97678 11.766 3.92599 11.95 3.92599C12.134 3.92599 12.3145 3.97678 12.4716 4.07277C12.6286 4.16876 12.7561 4.30623 12.84 4.47003L20.89 18.47C20.9892 18.6199 21.0462 18.7937 21.055 18.9732C21.0638 19.1527 21.0241 19.3312 20.94 19.49V19.47ZM12 8.00003C11.7348 8.00003 11.4804 8.10538 11.2929 8.29292C11.1054 8.48046 11 8.73481 11 9.00003V13C11 13.2652 11.1054 13.5196 11.2929 13.7071C11.4804 13.8947 11.7348 14 12 14C12.2652 14 12.5196 13.8947 12.7071 13.7071C12.8946 13.5196 13 13.2652 13 13V9.00003C13 8.73481 12.8946 8.48046 12.7071 8.29292C12.5196 8.10538 12.2652 8.00003 12 8.00003Z"></path></svg>Caution</p><div class="starlight-aside__content"><p>Scenarios <strong>C</strong> and <strong>I</strong> share every setting except <strong>Fallback to DHCP</strong>, and Scenarios <strong>A</strong>, <strong>E</strong>, and <strong>J</strong> share every setting except <strong>Fallback to DHCP</strong> and <strong>Persist source network interfaces</strong>. Those single differences change the result substantially, so confirm them against the detailed block before you migrate.</p></div></aside>
<hr>
<h2 id="a--keep-the-same-ip-and-the-same-mac">A — Keep the same IP and the same MAC</h2>
<p><strong>Use this when</strong></p>
<ul>
<li>The destination network carries the same subnet as the source.</li>
<li>The VM is powered on and its IP was discovered correctly.</li>
<li>DNS records, firewall rules, or MAC-locked licenses depend on the address surviving the move.</li>
</ul>
<p><strong>Settings</strong></p>
<table><thead><tr><th>Setting</th><th>Value</th></tr></thead><tbody><tr><td>Preserve IP</td><td>On</td></tr><tr><td>IP address box</td><td>Leave as-is (shows the discovered IP)</td></tr><tr><td>Preserve MAC</td><td>On</td></tr><tr><td>Fallback to DHCP</td><td>Off — you want the migration to stop rather than silently change the address</td></tr><tr><td>Persist source network interfaces</td><td>On — keeps the original interface names too</td></tr></tbody></table>
<p><strong>What you get</strong></p>
<ul>
<li><strong>OpenStack port:</strong> the same IP address, provided nothing else in the network already holds it.</li>
<li><strong>Port MAC:</strong> the same MAC address.</li>
<li><strong>Inside the guest:</strong> unchanged. A static NIC stays static on the same address; a DHCP NIC stays on DHCP. The original interface names are restored.</li>
</ul>
<aside aria-label="Caution" class="starlight-aside starlight-aside--caution"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 16C11.8022 16 11.6089 16.0587 11.4444 16.1686C11.28 16.2784 11.1518 16.4346 11.0761 16.6173C11.0004 16.8001 10.9806 17.0011 11.0192 17.1951C11.0578 17.3891 11.153 17.5673 11.2929 17.7071C11.4327 17.847 11.6109 17.9422 11.8049 17.9808C11.9989 18.0194 12.2 17.9996 12.3827 17.9239C12.5654 17.8482 12.7216 17.72 12.8315 17.5556C12.9413 17.3911 13 17.1978 13 17C13 16.7348 12.8946 16.4805 12.7071 16.2929C12.5196 16.1054 12.2652 16 12 16ZM22.67 17.47L14.62 3.47003C14.3598 3.00354 13.9798 2.61498 13.5192 2.3445C13.0586 2.07401 12.5341 1.9314 12 1.9314C11.4659 1.9314 10.9414 2.07401 10.4808 2.3445C10.0202 2.61498 9.64019 3.00354 9.38 3.47003L1.38 17.47C1.11079 17.924 0.966141 18.441 0.960643 18.9688C0.955144 19.4966 1.089 20.0166 1.34868 20.4761C1.60837 20.9356 1.9847 21.3185 2.43968 21.5861C2.89466 21.8536 3.41218 21.9964 3.94 22H20.06C20.5921 22.0053 21.1159 21.8689 21.5779 21.6049C22.0399 21.341 22.4234 20.9589 22.689 20.4978C22.9546 20.0368 23.0928 19.5134 23.0895 18.9814C23.0862 18.4493 22.9414 17.9277 22.67 17.47ZM20.94 19.47C20.8523 19.626 20.7245 19.7556 20.5697 19.8453C20.4149 19.935 20.2389 19.9815 20.06 19.98H3.94C3.76111 19.9815 3.5851 19.935 3.43032 19.8453C3.27553 19.7556 3.14765 19.626 3.06 19.47C2.97223 19.318 2.92602 19.1456 2.92602 18.97C2.92602 18.7945 2.97223 18.622 3.06 18.47L11.06 4.47003C11.1439 4.30623 11.2714 4.16876 11.4284 4.07277C11.5855 3.97678 11.766 3.92599 11.95 3.92599C12.134 3.92599 12.3145 3.97678 12.4716 4.07277C12.6286 4.16876 12.7561 4.30623 12.84 4.47003L20.89 18.47C20.9892 18.6199 21.0462 18.7937 21.055 18.9732C21.0638 19.1527 21.0241 19.3312 20.94 19.49V19.47ZM12 8.00003C11.7348 8.00003 11.4804 8.10538 11.2929 8.29292C11.1054 8.48046 11 8.73481 11 9.00003V13C11 13.2652 11.1054 13.5196 11.2929 13.7071C11.4804 13.8947 11.7348 14 12 14C12.2652 14 12.5196 13.8947 12.7071 13.7071C12.8946 13.5196 13 13.2652 13 13V9.00003C13 8.73481 12.8946 8.48046 12.7071 8.29292C12.5196 8.10538 12.2652 8.00003 12 8.00003Z"></path></svg>Caution</p><div class="starlight-aside__content"><p>If the address is already in use, the migration fails with a port conflict. That is deliberate — it stops you from creating a duplicate. Consider ticking <strong>Disconnect source network</strong> so the original VM releases the address first.</p><p><strong>Persist source network interfaces</strong> must be on for the “unchanged” guarantee above. If it is off, the guest outcome depends on the OS — see <a href="#j--preserve-ip-and-mac-but-persist-network-is-off">Scenario J</a>.</p></div></aside>
<h2 id="b--assign-a-specific-new-ip-address">B — Assign a specific new IP address</h2>
<p><strong>Use this when</strong></p>
<ul>
<li>You are re-addressing the VM as part of the move and already know the address it should get.</li>
</ul>
<p><strong>Settings</strong></p>
<table><thead><tr><th>Setting</th><th>Value</th></tr></thead><tbody><tr><td>Preserve IP</td><td>Off</td></tr><tr><td>IP address box</td><td>Type the new address — one IPv4 address only</td></tr><tr><td>Preserve MAC</td><td>Either — your choice</td></tr><tr><td>Fallback to DHCP</td><td>Off if a wrong address should stop the migration; on if a DHCP address is an acceptable substitute</td></tr><tr><td>Persist source network interfaces</td><td>Unavailable</td></tr></tbody></table>
<p><strong>What you get</strong></p>
<ul>
<li><strong>OpenStack port:</strong> the address you typed, provided it belongs to a subnet on the destination network.
<ul>
<li>If it does not belong to a subnet: the migration fails (Fallback off), or the port gets an OpenStack-assigned address (Fallback on).</li>
</ul>
</li>
<li><strong>Inside the guest:</strong> DHCP configuration on the assigned address.</li>
</ul>
<aside aria-label="Caution" class="starlight-aside starlight-aside--caution"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 16C11.8022 16 11.6089 16.0587 11.4444 16.1686C11.28 16.2784 11.1518 16.4346 11.0761 16.6173C11.0004 16.8001 10.9806 17.0011 11.0192 17.1951C11.0578 17.3891 11.153 17.5673 11.2929 17.7071C11.4327 17.847 11.6109 17.9422 11.8049 17.9808C11.9989 18.0194 12.2 17.9996 12.3827 17.9239C12.5654 17.8482 12.7216 17.72 12.8315 17.5556C12.9413 17.3911 13 17.1978 13 17C13 16.7348 12.8946 16.4805 12.7071 16.2929C12.5196 16.1054 12.2652 16 12 16ZM22.67 17.47L14.62 3.47003C14.3598 3.00354 13.9798 2.61498 13.5192 2.3445C13.0586 2.07401 12.5341 1.9314 12 1.9314C11.4659 1.9314 10.9414 2.07401 10.4808 2.3445C10.0202 2.61498 9.64019 3.00354 9.38 3.47003L1.38 17.47C1.11079 17.924 0.966141 18.441 0.960643 18.9688C0.955144 19.4966 1.089 20.0166 1.34868 20.4761C1.60837 20.9356 1.9847 21.3185 2.43968 21.5861C2.89466 21.8536 3.41218 21.9964 3.94 22H20.06C20.5921 22.0053 21.1159 21.8689 21.5779 21.6049C22.0399 21.341 22.4234 20.9589 22.689 20.4978C22.9546 20.0368 23.0928 19.5134 23.0895 18.9814C23.0862 18.4493 22.9414 17.9277 22.67 17.47ZM20.94 19.47C20.8523 19.626 20.7245 19.7556 20.5697 19.8453C20.4149 19.935 20.2389 19.9815 20.06 19.98H3.94C3.76111 19.9815 3.5851 19.935 3.43032 19.8453C3.27553 19.7556 3.14765 19.626 3.06 19.47C2.97223 19.318 2.92602 19.1456 2.92602 18.97C2.92602 18.7945 2.97223 18.622 3.06 18.47L11.06 4.47003C11.1439 4.30623 11.2714 4.16876 11.4284 4.07277C11.5855 3.97678 11.766 3.92599 11.95 3.92599C12.134 3.92599 12.3145 3.97678 12.4716 4.07277C12.6286 4.16876 12.7561 4.30623 12.84 4.47003L20.89 18.47C20.9892 18.6199 21.0462 18.7937 21.055 18.9732C21.0638 19.1527 21.0241 19.3312 20.94 19.49V19.47ZM12 8.00003C11.7348 8.00003 11.4804 8.10538 11.2929 8.29292C11.1054 8.48046 11 8.73481 11 9.00003V13C11 13.2652 11.1054 13.5196 11.2929 13.7071C11.4804 13.8947 11.7348 14 12 14C12.2652 14 12.5196 13.8947 12.7071 13.7071C12.8946 13.5196 13 13.2652 13 13V9.00003C13 8.73481 12.8946 8.48046 12.7071 8.29292C12.5196 8.10538 12.2652 8.00003 12 8.00003Z"></path></svg>Caution</p><div class="starlight-aside__content"><p><strong>One address per NIC.</strong> Two addresses are rejected with “Multiple IPs are not supported when Preserve IP is disabled”.</p><p>A typed address carries no prefix length, so the guest assumes <code dir="auto">/24</code>. Verify the netmask if your subnet is not a <code dir="auto">/24</code>.</p></div></aside>
<h2 id="c--force-everything-onto-dhcp">C — Force everything onto DHCP</h2>
<p><strong>Use this when</strong></p>
<ul>
<li>You want a clean start: OpenStack allocates all addresses and no source addressing is carried over.</li>
</ul>
<p><strong>Settings</strong></p>
<table><thead><tr><th>Setting</th><th>Value</th></tr></thead><tbody><tr><td>Preserve IP</td><td>Off on every NIC</td></tr><tr><td>IP address box</td><td>Empty</td></tr><tr><td>Preserve MAC</td><td>Either — your choice</td></tr><tr><td>Fallback to DHCP</td><td>On — required, see below</td></tr><tr><td>Persist source network interfaces</td><td>Unavailable</td></tr></tbody></table>
<p><strong>What you get</strong></p>
<ul>
<li><strong>OpenStack port:</strong> an address allocated by OpenStack.</li>
<li><strong>Port MAC:</strong> preserved or newly generated, per your choice.</li>
<li><strong>Inside the guest:</strong> DHCP.</li>
</ul>
<aside aria-label="Caution" class="starlight-aside starlight-aside--caution"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 16C11.8022 16 11.6089 16.0587 11.4444 16.1686C11.28 16.2784 11.1518 16.4346 11.0761 16.6173C11.0004 16.8001 10.9806 17.0011 11.0192 17.1951C11.0578 17.3891 11.153 17.5673 11.2929 17.7071C11.4327 17.847 11.6109 17.9422 11.8049 17.9808C11.9989 18.0194 12.2 17.9996 12.3827 17.9239C12.5654 17.8482 12.7216 17.72 12.8315 17.5556C12.9413 17.3911 13 17.1978 13 17C13 16.7348 12.8946 16.4805 12.7071 16.2929C12.5196 16.1054 12.2652 16 12 16ZM22.67 17.47L14.62 3.47003C14.3598 3.00354 13.9798 2.61498 13.5192 2.3445C13.0586 2.07401 12.5341 1.9314 12 1.9314C11.4659 1.9314 10.9414 2.07401 10.4808 2.3445C10.0202 2.61498 9.64019 3.00354 9.38 3.47003L1.38 17.47C1.11079 17.924 0.966141 18.441 0.960643 18.9688C0.955144 19.4966 1.089 20.0166 1.34868 20.4761C1.60837 20.9356 1.9847 21.3185 2.43968 21.5861C2.89466 21.8536 3.41218 21.9964 3.94 22H20.06C20.5921 22.0053 21.1159 21.8689 21.5779 21.6049C22.0399 21.341 22.4234 20.9589 22.689 20.4978C22.9546 20.0368 23.0928 19.5134 23.0895 18.9814C23.0862 18.4493 22.9414 17.9277 22.67 17.47ZM20.94 19.47C20.8523 19.626 20.7245 19.7556 20.5697 19.8453C20.4149 19.935 20.2389 19.9815 20.06 19.98H3.94C3.76111 19.9815 3.5851 19.935 3.43032 19.8453C3.27553 19.7556 3.14765 19.626 3.06 19.47C2.97223 19.318 2.92602 19.1456 2.92602 18.97C2.92602 18.7945 2.97223 18.622 3.06 18.47L11.06 4.47003C11.1439 4.30623 11.2714 4.16876 11.4284 4.07277C11.5855 3.97678 11.766 3.92599 11.95 3.92599C12.134 3.92599 12.3145 3.97678 12.4716 4.07277C12.6286 4.16876 12.7561 4.30623 12.84 4.47003L20.89 18.47C20.9892 18.6199 21.0462 18.7937 21.055 18.9732C21.0638 19.1527 21.0241 19.3312 20.94 19.49V19.47ZM12 8.00003C11.7348 8.00003 11.4804 8.10538 11.2929 8.29292C11.1054 8.48046 11 8.73481 11 9.00003V13C11 13.2652 11.1054 13.5196 11.2929 13.7071C11.4804 13.8947 11.7348 14 12 14C12.2652 14 12.5196 13.8947 12.7071 13.7071C12.8946 13.5196 13 13.2652 13 13V9.00003C13 8.73481 12.8946 8.48046 12.7071 8.29292C12.5196 8.10538 12.2652 8.00003 12 8.00003Z"></path></svg>Caution</p><div class="starlight-aside__content"><p><strong>Fallback to DHCP must be on.</strong> With it off, this same combination produces a port with no address at all — see <a href="#i--create-the-port-with-no-address-at-all">Scenario I</a>.</p></div></aside>
<h2 id="d--the-destination-is-on-a-different-subnet">D — The destination is on a different subnet</h2>
<p><strong>Use this when</strong></p>
<ul>
<li>The destination OpenStack network does not carry the source VM’s subnet.</li>
</ul>
<p>This is the most common cause of failed migrations.</p>
<p><strong>Settings</strong></p>
<table><thead><tr><th>Setting</th><th>Value</th></tr></thead><tbody><tr><td>Preserve IP</td><td>Off</td></tr><tr><td>IP address box</td><td>Empty (or type an address valid in the new subnet — see <a href="#b--assign-a-specific-new-ip-address">Scenario B</a>)</td></tr><tr><td>Preserve MAC</td><td>Either — your choice</td></tr><tr><td>Fallback to DHCP</td><td>On — required</td></tr><tr><td>Persist source network interfaces</td><td>Unavailable — the UI greys it out automatically</td></tr></tbody></table>
<p><strong>What you get</strong></p>
<ul>
<li><strong>OpenStack port:</strong> an address allocated by OpenStack from the destination subnet.</li>
<li><strong>Port MAC:</strong> the same MAC if Preserve MAC is on, otherwise a newly generated one.</li>
<li><strong>Inside the guest:</strong> DHCP.</li>
</ul>
<aside aria-label="Caution" class="starlight-aside starlight-aside--caution"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 16C11.8022 16 11.6089 16.0587 11.4444 16.1686C11.28 16.2784 11.1518 16.4346 11.0761 16.6173C11.0004 16.8001 10.9806 17.0011 11.0192 17.1951C11.0578 17.3891 11.153 17.5673 11.2929 17.7071C11.4327 17.847 11.6109 17.9422 11.8049 17.9808C11.9989 18.0194 12.2 17.9996 12.3827 17.9239C12.5654 17.8482 12.7216 17.72 12.8315 17.5556C12.9413 17.3911 13 17.1978 13 17C13 16.7348 12.8946 16.4805 12.7071 16.2929C12.5196 16.1054 12.2652 16 12 16ZM22.67 17.47L14.62 3.47003C14.3598 3.00354 13.9798 2.61498 13.5192 2.3445C13.0586 2.07401 12.5341 1.9314 12 1.9314C11.4659 1.9314 10.9414 2.07401 10.4808 2.3445C10.0202 2.61498 9.64019 3.00354 9.38 3.47003L1.38 17.47C1.11079 17.924 0.966141 18.441 0.960643 18.9688C0.955144 19.4966 1.089 20.0166 1.34868 20.4761C1.60837 20.9356 1.9847 21.3185 2.43968 21.5861C2.89466 21.8536 3.41218 21.9964 3.94 22H20.06C20.5921 22.0053 21.1159 21.8689 21.5779 21.6049C22.0399 21.341 22.4234 20.9589 22.689 20.4978C22.9546 20.0368 23.0928 19.5134 23.0895 18.9814C23.0862 18.4493 22.9414 17.9277 22.67 17.47ZM20.94 19.47C20.8523 19.626 20.7245 19.7556 20.5697 19.8453C20.4149 19.935 20.2389 19.9815 20.06 19.98H3.94C3.76111 19.9815 3.5851 19.935 3.43032 19.8453C3.27553 19.7556 3.14765 19.626 3.06 19.47C2.97223 19.318 2.92602 19.1456 2.92602 18.97C2.92602 18.7945 2.97223 18.622 3.06 18.47L11.06 4.47003C11.1439 4.30623 11.2714 4.16876 11.4284 4.07277C11.5855 3.97678 11.766 3.92599 11.95 3.92599C12.134 3.92599 12.3145 3.97678 12.4716 4.07277C12.6286 4.16876 12.7561 4.30623 12.84 4.47003L20.89 18.47C20.9892 18.6199 21.0462 18.7937 21.055 18.9732C21.0638 19.1527 21.0241 19.3312 20.94 19.49V19.47ZM12 8.00003C11.7348 8.00003 11.4804 8.10538 11.2929 8.29292C11.1054 8.48046 11 8.73481 11 9.00003V13C11 13.2652 11.1054 13.5196 11.2929 13.7071C11.4804 13.8947 11.7348 14 12 14C12.2652 14 12.5196 13.8947 12.7071 13.7071C12.8946 13.5196 13 13.2652 13 13V9.00003C13 8.73481 12.8946 8.48046 12.7071 8.29292C12.5196 8.10538 12.2652 8.00003 12 8.00003Z"></path></svg>Caution</p><div class="starlight-aside__content"><p><strong>Preserve IP on</strong> with <strong>Fallback to DHCP off</strong> is the failure case — the port cannot be created and the migration stops, but only if the source NIC actually had an address. A NIC with no discovered IP is fine.</p><p><strong>Preserve IP on</strong> with <strong>Fallback to DHCP on</strong> is tolerable: you still land on a DHCP address and keep the MAC without editing each NIC. Turning Preserve IP off is clearer.</p></div></aside>
<h2 id="e--prefer-the-same-ip-but-accept-dhcp-rather-than-fail">E — Prefer the same IP, but accept DHCP rather than fail</h2>
<p><strong>Use this when</strong></p>
<ul>
<li>Same subnet as Scenario A, but you are migrating in bulk and would rather a few VMs come up on a different address than have the whole batch stop.</li>
</ul>
<p><strong>Settings</strong></p>
<table><thead><tr><th>Setting</th><th>Value</th></tr></thead><tbody><tr><td>Preserve IP</td><td>On</td></tr><tr><td>IP address box</td><td>Leave as-is</td></tr><tr><td>Preserve MAC</td><td>On</td></tr><tr><td>Fallback to DHCP</td><td>On</td></tr><tr><td>Persist source network interfaces</td><td>On</td></tr></tbody></table>
<p><strong>What you get</strong></p>
<ul>
<li><strong>OpenStack port:</strong> the same IP where possible; an OpenStack-assigned address where not.</li>
<li><strong>Port MAC:</strong> the same MAC address.</li>
<li><strong>Inside the guest:</strong> the original static configuration where the address was preserved; DHCP where it was not.</li>
</ul>
<aside aria-label="Caution" class="starlight-aside starlight-aside--caution"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 16C11.8022 16 11.6089 16.0587 11.4444 16.1686C11.28 16.2784 11.1518 16.4346 11.0761 16.6173C11.0004 16.8001 10.9806 17.0011 11.0192 17.1951C11.0578 17.3891 11.153 17.5673 11.2929 17.7071C11.4327 17.847 11.6109 17.9422 11.8049 17.9808C11.9989 18.0194 12.2 17.9996 12.3827 17.9239C12.5654 17.8482 12.7216 17.72 12.8315 17.5556C12.9413 17.3911 13 17.1978 13 17C13 16.7348 12.8946 16.4805 12.7071 16.2929C12.5196 16.1054 12.2652 16 12 16ZM22.67 17.47L14.62 3.47003C14.3598 3.00354 13.9798 2.61498 13.5192 2.3445C13.0586 2.07401 12.5341 1.9314 12 1.9314C11.4659 1.9314 10.9414 2.07401 10.4808 2.3445C10.0202 2.61498 9.64019 3.00354 9.38 3.47003L1.38 17.47C1.11079 17.924 0.966141 18.441 0.960643 18.9688C0.955144 19.4966 1.089 20.0166 1.34868 20.4761C1.60837 20.9356 1.9847 21.3185 2.43968 21.5861C2.89466 21.8536 3.41218 21.9964 3.94 22H20.06C20.5921 22.0053 21.1159 21.8689 21.5779 21.6049C22.0399 21.341 22.4234 20.9589 22.689 20.4978C22.9546 20.0368 23.0928 19.5134 23.0895 18.9814C23.0862 18.4493 22.9414 17.9277 22.67 17.47ZM20.94 19.47C20.8523 19.626 20.7245 19.7556 20.5697 19.8453C20.4149 19.935 20.2389 19.9815 20.06 19.98H3.94C3.76111 19.9815 3.5851 19.935 3.43032 19.8453C3.27553 19.7556 3.14765 19.626 3.06 19.47C2.97223 19.318 2.92602 19.1456 2.92602 18.97C2.92602 18.7945 2.97223 18.622 3.06 18.47L11.06 4.47003C11.1439 4.30623 11.2714 4.16876 11.4284 4.07277C11.5855 3.97678 11.766 3.92599 11.95 3.92599C12.134 3.92599 12.3145 3.97678 12.4716 4.07277C12.6286 4.16876 12.7561 4.30623 12.84 4.47003L20.89 18.47C20.9892 18.6199 21.0462 18.7937 21.055 18.9732C21.0638 19.1527 21.0241 19.3312 20.94 19.49V19.47ZM12 8.00003C11.7348 8.00003 11.4804 8.10538 11.2929 8.29292C11.1054 8.48046 11 8.73481 11 9.00003V13C11 13.2652 11.1054 13.5196 11.2929 13.7071C11.4804 13.8947 11.7348 14 12 14C12.2652 14 12.5196 13.8947 12.7071 13.7071C12.8946 13.5196 13 13.2652 13 13V9.00003C13 8.73481 12.8946 8.48046 12.7071 8.29292C12.5196 8.10538 12.2652 8.00003 12 8.00003Z"></path></svg>Caution</p><div class="starlight-aside__content"><p>You will not be stopped when an address changes. Check the migration report afterward to see which VMs changed address.</p><p>As with Scenario A, the guest outcome above assumes <strong>Persist source network interfaces</strong> is on. If it is off, see <a href="#j--preserve-ip-and-mac-but-persist-network-is-off">Scenario J</a>.</p></div></aside>
<h2 id="f--the-destination-is-an-l2-only-network">F — The destination is an L2-only network</h2>
<p><strong>Use this when</strong></p>
<ul>
<li>The destination OpenStack network is tagged as an L2 network and has no subnets.</li>
</ul>
<p><strong>Settings</strong></p>
<table><thead><tr><th>Setting</th><th>Value</th></tr></thead><tbody><tr><td>Preserve IP</td><td>No effect on the port — no fixed IPs can be assigned</td></tr><tr><td>IP address box</td><td>Ignored</td></tr><tr><td>Preserve MAC</td><td>Works normally — keep it on if you need the MAC</td></tr><tr><td>Fallback to DHCP</td><td>Greyed out</td></tr><tr><td>Persist source network interfaces</td><td>Your choice</td></tr></tbody></table>
<p><strong>What you get</strong></p>
<ul>
<li><strong>OpenStack port:</strong> created with no fixed IP addresses.</li>
<li><strong>Port MAC:</strong> preserved or newly generated, per your choice.</li>
<li><strong>Inside the guest (Ubuntu with netplan):</strong> a wildcard configuration puts every interface on DHCP.</li>
</ul>
<aside aria-label="Caution" class="starlight-aside starlight-aside--caution"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 16C11.8022 16 11.6089 16.0587 11.4444 16.1686C11.28 16.2784 11.1518 16.4346 11.0761 16.6173C11.0004 16.8001 10.9806 17.0011 11.0192 17.1951C11.0578 17.3891 11.153 17.5673 11.2929 17.7071C11.4327 17.847 11.6109 17.9422 11.8049 17.9808C11.9989 18.0194 12.2 17.9996 12.3827 17.9239C12.5654 17.8482 12.7216 17.72 12.8315 17.5556C12.9413 17.3911 13 17.1978 13 17C13 16.7348 12.8946 16.4805 12.7071 16.2929C12.5196 16.1054 12.2652 16 12 16ZM22.67 17.47L14.62 3.47003C14.3598 3.00354 13.9798 2.61498 13.5192 2.3445C13.0586 2.07401 12.5341 1.9314 12 1.9314C11.4659 1.9314 10.9414 2.07401 10.4808 2.3445C10.0202 2.61498 9.64019 3.00354 9.38 3.47003L1.38 17.47C1.11079 17.924 0.966141 18.441 0.960643 18.9688C0.955144 19.4966 1.089 20.0166 1.34868 20.4761C1.60837 20.9356 1.9847 21.3185 2.43968 21.5861C2.89466 21.8536 3.41218 21.9964 3.94 22H20.06C20.5921 22.0053 21.1159 21.8689 21.5779 21.6049C22.0399 21.341 22.4234 20.9589 22.689 20.4978C22.9546 20.0368 23.0928 19.5134 23.0895 18.9814C23.0862 18.4493 22.9414 17.9277 22.67 17.47ZM20.94 19.47C20.8523 19.626 20.7245 19.7556 20.5697 19.8453C20.4149 19.935 20.2389 19.9815 20.06 19.98H3.94C3.76111 19.9815 3.5851 19.935 3.43032 19.8453C3.27553 19.7556 3.14765 19.626 3.06 19.47C2.97223 19.318 2.92602 19.1456 2.92602 18.97C2.92602 18.7945 2.97223 18.622 3.06 18.47L11.06 4.47003C11.1439 4.30623 11.2714 4.16876 11.4284 4.07277C11.5855 3.97678 11.766 3.92599 11.95 3.92599C12.134 3.92599 12.3145 3.97678 12.4716 4.07277C12.6286 4.16876 12.7561 4.30623 12.84 4.47003L20.89 18.47C20.9892 18.6199 21.0462 18.7937 21.055 18.9732C21.0638 19.1527 21.0241 19.3312 20.94 19.49V19.47ZM12 8.00003C11.7348 8.00003 11.4804 8.10538 11.2929 8.29292C11.1054 8.48046 11 8.73481 11 9.00003V13C11 13.2652 11.1054 13.5196 11.2929 13.7071C11.4804 13.8947 11.7348 14 12 14C12.2652 14 12.5196 13.8947 12.7071 13.7071C12.8946 13.5196 13 13.2652 13 13V9.00003C13 8.73481 12.8946 8.48046 12.7071 8.29292C12.5196 8.10538 12.2652 8.00003 12 8.00003Z"></path></svg>Caution</p><div class="starlight-aside__content"><p>Nothing in vJailbreak assigns addresses on an L2 network. Make sure a DHCP server is reachable on that segment, or plan to configure the guest by hand.</p></div></aside>
<h2 id="g--keep-the-ip-but-let-openstack-pick-a-new-mac">G — Keep the IP but let OpenStack pick a new MAC</h2>
<p><strong>Use this when</strong></p>
<ul>
<li>The source MAC clashes with something in the destination, or you are deliberately re-issuing hardware addresses.</li>
</ul>
<p><strong>Settings</strong></p>
<table><thead><tr><th>Setting</th><th>Value</th></tr></thead><tbody><tr><td>Preserve IP</td><td>On</td></tr><tr><td>IP address box</td><td>Leave as-is</td></tr><tr><td>Preserve MAC</td><td>Off</td></tr><tr><td>Fallback to DHCP</td><td>Your choice — as in Scenarios A and E</td></tr><tr><td>Persist source network interfaces</td><td>Your choice</td></tr></tbody></table>
<p><strong>What you get</strong></p>
<ul>
<li><strong>OpenStack port:</strong> the same IP address.</li>
<li><strong>Port MAC:</strong> a newly generated address. The UI shows a warning triangle next to the NIC to confirm this.</li>
<li><strong>Inside the guest:</strong> DHCP. The guest cannot match its old static settings to a hardware address it has never seen.</li>
</ul>
<aside aria-label="Caution" class="starlight-aside starlight-aside--caution"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 16C11.8022 16 11.6089 16.0587 11.4444 16.1686C11.28 16.2784 11.1518 16.4346 11.0761 16.6173C11.0004 16.8001 10.9806 17.0011 11.0192 17.1951C11.0578 17.3891 11.153 17.5673 11.2929 17.7071C11.4327 17.847 11.6109 17.9422 11.8049 17.9808C11.9989 18.0194 12.2 17.9996 12.3827 17.9239C12.5654 17.8482 12.7216 17.72 12.8315 17.5556C12.9413 17.3911 13 17.1978 13 17C13 16.7348 12.8946 16.4805 12.7071 16.2929C12.5196 16.1054 12.2652 16 12 16ZM22.67 17.47L14.62 3.47003C14.3598 3.00354 13.9798 2.61498 13.5192 2.3445C13.0586 2.07401 12.5341 1.9314 12 1.9314C11.4659 1.9314 10.9414 2.07401 10.4808 2.3445C10.0202 2.61498 9.64019 3.00354 9.38 3.47003L1.38 17.47C1.11079 17.924 0.966141 18.441 0.960643 18.9688C0.955144 19.4966 1.089 20.0166 1.34868 20.4761C1.60837 20.9356 1.9847 21.3185 2.43968 21.5861C2.89466 21.8536 3.41218 21.9964 3.94 22H20.06C20.5921 22.0053 21.1159 21.8689 21.5779 21.6049C22.0399 21.341 22.4234 20.9589 22.689 20.4978C22.9546 20.0368 23.0928 19.5134 23.0895 18.9814C23.0862 18.4493 22.9414 17.9277 22.67 17.47ZM20.94 19.47C20.8523 19.626 20.7245 19.7556 20.5697 19.8453C20.4149 19.935 20.2389 19.9815 20.06 19.98H3.94C3.76111 19.9815 3.5851 19.935 3.43032 19.8453C3.27553 19.7556 3.14765 19.626 3.06 19.47C2.97223 19.318 2.92602 19.1456 2.92602 18.97C2.92602 18.7945 2.97223 18.622 3.06 18.47L11.06 4.47003C11.1439 4.30623 11.2714 4.16876 11.4284 4.07277C11.5855 3.97678 11.766 3.92599 11.95 3.92599C12.134 3.92599 12.3145 3.97678 12.4716 4.07277C12.6286 4.16876 12.7561 4.30623 12.84 4.47003L20.89 18.47C20.9892 18.6199 21.0462 18.7937 21.055 18.9732C21.0638 19.1527 21.0241 19.3312 20.94 19.49V19.47ZM12 8.00003C11.7348 8.00003 11.4804 8.10538 11.2929 8.29292C11.1054 8.48046 11 8.73481 11 9.00003V13C11 13.2652 11.1054 13.5196 11.2929 13.7071C11.4804 13.8947 11.7348 14 12 14C12.2652 14 12.5196 13.8947 12.7071 13.7071C12.8946 13.5196 13 13.2652 13 13V9.00003C13 8.73481 12.8946 8.48046 12.7071 8.29292C12.5196 8.10538 12.2652 8.00003 12 8.00003Z"></path></svg>Caution</p><div class="starlight-aside__content"><p>Anything license-locked to the MAC address will break.</p><p>Interface names inside the guest may change, because names are recovered by matching on the MAC.</p></div></aside>
<h2 id="h--the-source-vm-is-powered-off">H — The source VM is powered off</h2>
<p><strong>Use this when</strong></p>
<ul>
<li>The VM is not running, so VMware Tools reported no addresses.</li>
</ul>
<p><strong>Settings</strong></p>
<table><thead><tr><th>Setting</th><th>Value</th></tr></thead><tbody><tr><td>Preserve IP</td><td>Forced off and greyed out — nothing to preserve</td></tr><tr><td>IP address box</td><td>Type the address you want, or leave empty for DHCP</td></tr><tr><td>Preserve MAC</td><td>Available, and usually worth keeping on</td></tr><tr><td>Fallback to DHCP</td><td>On if you left the address box empty</td></tr><tr><td>Persist source network interfaces</td><td>Unavailable</td></tr></tbody></table>
<p><strong>What you get</strong></p>
<ul>
<li><strong>OpenStack port:</strong> your typed address, an OpenStack-assigned one, or no address if the box was empty with Fallback off.</li>
<li><strong>Port MAC:</strong> preserved. The MAC is read from the virtual NIC rather than the guest, so it survives a powered-off migration.</li>
<li><strong>Inside the guest:</strong> no IP configuration is injected if no address was requested.</li>
</ul>
<aside aria-label="Tip" class="starlight-aside starlight-aside--tip"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path fill-rule="evenodd" clip-rule="evenodd" d="M1.43909 8.85483L1.44039 8.85354L4.96668 5.33815C5.30653 4.99386 5.7685 4.79662 6.2524 4.78972L6.26553 4.78963L12.9014 4.78962L13.8479 3.84308C16.9187 0.772319 20.0546 0.770617 21.4678 0.975145C21.8617 1.02914 22.2271 1.21053 22.5083 1.4917C22.7894 1.77284 22.9708 2.13821 23.0248 2.53199C23.2294 3.94517 23.2278 7.08119 20.1569 10.1521L19.2107 11.0983V17.7338L19.2106 17.7469C19.2037 18.2308 19.0067 18.6933 18.6624 19.0331L15.1456 22.5608C14.9095 22.7966 14.6137 22.964 14.29 23.0449C13.9663 23.1259 13.6267 23.1174 13.3074 23.0204C12.9881 22.9235 12.7011 22.7417 12.4771 22.4944C12.2533 22.2473 12.1006 21.9441 12.0355 21.6171L11.1783 17.3417L6.65869 12.822L4.34847 12.3589L2.38351 11.965C2.05664 11.8998 1.75272 11.747 1.50564 11.5232C1.25835 11.2992 1.07653 11.0122 0.979561 10.6929C0.882595 10.3736 0.874125 10.034 0.955057 9.7103C1.03599 9.38659 1.20328 9.09092 1.43909 8.85483ZM6.8186 10.8724L2.94619 10.096L6.32006 6.73268H10.9583L6.8186 10.8724ZM15.2219 5.21703C17.681 2.75787 20.0783 2.75376 21.1124 2.8876C21.2462 3.92172 21.2421 6.31895 18.783 8.77812L12.0728 15.4883L8.51172 11.9272L15.2219 5.21703ZM13.9042 21.0538L13.1279 17.1811L17.2676 13.0414V17.68L13.9042 21.0538Z"></path><path d="M9.31827 18.3446C9.45046 17.8529 9.17864 17.3369 8.68945 17.1724C8.56178 17.1294 8.43145 17.1145 8.30512 17.1243C8.10513 17.1398 7.91519 17.2172 7.76181 17.3434C7.62613 17.455 7.51905 17.6048 7.45893 17.7835C6.97634 19.2186 5.77062 19.9878 4.52406 20.4029C4.08525 20.549 3.6605 20.644 3.29471 20.7053C3.35607 20.3395 3.45098 19.9148 3.59711 19.476C4.01221 18.2294 4.78141 17.0237 6.21648 16.5411C6.39528 16.481 6.54504 16.3739 6.65665 16.2382C6.85126 16.0016 6.92988 15.678 6.84417 15.3647C6.83922 15.3466 6.83373 15.3286 6.82767 15.3106C6.74106 15.053 6.55701 14.8557 6.33037 14.7459C6.10949 14.6389 5.84816 14.615 5.59715 14.6994C5.47743 14.7397 5.36103 14.7831 5.24786 14.8294C3.22626 15.6569 2.2347 17.4173 1.75357 18.8621C1.49662 19.6337 1.36993 20.3554 1.30679 20.8818C1.27505 21.1464 1.25893 21.3654 1.25072 21.5213C1.24662 21.5993 1.24448 21.6618 1.24337 21.7066L1.243 21.7226L1.24235 21.7605L1.2422 21.7771L1.24217 21.7827L1.24217 21.7856C1.24217 22.3221 1.67703 22.7579 2.2137 22.7579L2.2155 22.7579L2.22337 22.7578L2.23956 22.7577C2.25293 22.7575 2.27096 22.7572 2.29338 22.7567C2.33821 22.7555 2.40073 22.7534 2.47876 22.7493C2.63466 22.7411 2.85361 22.725 3.11822 22.6932C3.64462 22.6301 4.36636 22.5034 5.13797 22.2464C6.58274 21.7653 8.3431 20.7738 9.17063 18.7522C9.21696 18.639 9.26037 18.5226 9.30064 18.4029C9.30716 18.3835 9.31304 18.364 9.31827 18.3446Z"></path></svg>Tip</p><div class="starlight-aside__content"><p>If you know the VM’s address, power it on briefly before migrating so vJailbreak can discover it — that unlocks <a href="#a--keep-the-same-ip-and-the-same-mac">Scenario A</a>.</p></div></aside>
<h2 id="i--create-the-port-with-no-address-at-all">I — Create the port with no address at all</h2>
<p><strong>Use this when</strong></p>
<ul>
<li>You intend to configure addressing yourself after the migration, and want the port attached but unaddressed.</li>
</ul>
<p>Rarely used. If you reached this by accident, you probably wanted <a href="#c--force-everything-onto-dhcp">Scenario C</a>.</p>
<p><strong>Settings</strong></p>
<table><thead><tr><th>Setting</th><th>Value</th></tr></thead><tbody><tr><td>Preserve IP</td><td>Off</td></tr><tr><td>IP address box</td><td>Empty</td></tr><tr><td>Preserve MAC</td><td>Either — your choice</td></tr><tr><td>Fallback to DHCP</td><td>Off</td></tr><tr><td>Persist source network interfaces</td><td>Unavailable</td></tr></tbody></table>
<p><strong>What you get</strong></p>
<ul>
<li><strong>OpenStack port:</strong> created and attached, with no fixed IP.</li>
<li><strong>Port MAC:</strong> preserved or newly generated, per your choice.</li>
<li><strong>Inside the guest:</strong> that interface is skipped entirely. No address, no DHCP client, nothing.</li>
</ul>
<aside aria-label="Caution" class="starlight-aside starlight-aside--caution"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 16C11.8022 16 11.6089 16.0587 11.4444 16.1686C11.28 16.2784 11.1518 16.4346 11.0761 16.6173C11.0004 16.8001 10.9806 17.0011 11.0192 17.1951C11.0578 17.3891 11.153 17.5673 11.2929 17.7071C11.4327 17.847 11.6109 17.9422 11.8049 17.9808C11.9989 18.0194 12.2 17.9996 12.3827 17.9239C12.5654 17.8482 12.7216 17.72 12.8315 17.5556C12.9413 17.3911 13 17.1978 13 17C13 16.7348 12.8946 16.4805 12.7071 16.2929C12.5196 16.1054 12.2652 16 12 16ZM22.67 17.47L14.62 3.47003C14.3598 3.00354 13.9798 2.61498 13.5192 2.3445C13.0586 2.07401 12.5341 1.9314 12 1.9314C11.4659 1.9314 10.9414 2.07401 10.4808 2.3445C10.0202 2.61498 9.64019 3.00354 9.38 3.47003L1.38 17.47C1.11079 17.924 0.966141 18.441 0.960643 18.9688C0.955144 19.4966 1.089 20.0166 1.34868 20.4761C1.60837 20.9356 1.9847 21.3185 2.43968 21.5861C2.89466 21.8536 3.41218 21.9964 3.94 22H20.06C20.5921 22.0053 21.1159 21.8689 21.5779 21.6049C22.0399 21.341 22.4234 20.9589 22.689 20.4978C22.9546 20.0368 23.0928 19.5134 23.0895 18.9814C23.0862 18.4493 22.9414 17.9277 22.67 17.47ZM20.94 19.47C20.8523 19.626 20.7245 19.7556 20.5697 19.8453C20.4149 19.935 20.2389 19.9815 20.06 19.98H3.94C3.76111 19.9815 3.5851 19.935 3.43032 19.8453C3.27553 19.7556 3.14765 19.626 3.06 19.47C2.97223 19.318 2.92602 19.1456 2.92602 18.97C2.92602 18.7945 2.97223 18.622 3.06 18.47L11.06 4.47003C11.1439 4.30623 11.2714 4.16876 11.4284 4.07277C11.5855 3.97678 11.766 3.92599 11.95 3.92599C12.134 3.92599 12.3145 3.97678 12.4716 4.07277C12.6286 4.16876 12.7561 4.30623 12.84 4.47003L20.89 18.47C20.9892 18.6199 21.0462 18.7937 21.055 18.9732C21.0638 19.1527 21.0241 19.3312 20.94 19.49V19.47ZM12 8.00003C11.7348 8.00003 11.4804 8.10538 11.2929 8.29292C11.1054 8.48046 11 8.73481 11 9.00003V13C11 13.2652 11.1054 13.5196 11.2929 13.7071C11.4804 13.8947 11.7348 14 12 14C12.2652 14 12.5196 13.8947 12.7071 13.7071C12.8946 13.5196 13 13.2652 13 13V9.00003C13 8.73481 12.8946 8.48046 12.7071 8.29292C12.5196 8.10538 12.2652 8.00003 12 8.00003Z"></path></svg>Caution</p><div class="starlight-aside__content"><p>The VM will boot with an unconfigured NIC and no network reachability on it. Have console access ready.</p></div></aside>
<h2 id="j--preserve-ip-and-mac-but-persist-network-is-off">J — Preserve IP and MAC, but Persist Network is off</h2>
<p><strong>Use this when</strong></p>
<ul>
<li>You want the address and MAC carried over, but do not need the original interface names restored.</li>
<li>Or <strong>Persist source network interfaces</strong> was simply left at its default (off) and you want to know what to expect.</li>
</ul>
<p>This is the case Scenarios A and E refer to. The port outcome is identical to them — only the guest differs.</p>
<p><strong>Settings</strong></p>
<table><thead><tr><th>Setting</th><th>Value</th></tr></thead><tbody><tr><td>Preserve IP</td><td>On</td></tr><tr><td>IP address box</td><td>Leave as-is</td></tr><tr><td>Preserve MAC</td><td>On</td></tr><tr><td>Fallback to DHCP</td><td>Your choice — as in Scenarios A and E</td></tr><tr><td>Persist source network interfaces</td><td>Off</td></tr></tbody></table>
<p><strong>What you get</strong></p>
<ul>
<li><strong>OpenStack port:</strong> exactly as in Scenario A or E — the preserved IP, or a DHCP address if Fallback rescued it.</li>
<li><strong>Port MAC:</strong> the same MAC address.</li>
<li><strong>Inside the guest:</strong> this is where it differs, and it depends on the guest OS rather than on the source configuration.</li>
</ul>
<p><strong>Guest outcome by OS</strong></p>
<table><thead><tr><th>Guest OS</th><th>Source NIC was on DHCP</th><th>Source NIC was static</th></tr></thead><tbody><tr><td>Ubuntu 17.10 and newer</td><td>Converted to a static address — pinned to whatever address it happened to hold when discovered</td><td>Stays static on the same address</td></tr><tr><td>Ubuntu older than 17.10</td><td>Stays on DHCP. Only interface-name rules are written</td><td>Stays static, per the guest’s own configuration</td></tr><tr><td>RHEL family 6 and older</td><td>Legacy interface handling runs — verify after boot</td><td>Legacy interface handling runs — verify after boot</td></tr><tr><td>RHEL / CentOS / Rocky 7+, SUSE, other Linux</td><td>Nothing is written. The guest keeps its own configuration</td><td>Nothing is written. The guest keeps its own configuration</td></tr><tr><td>Windows</td><td>Nothing is written. The guest keeps its own configuration</td><td>Nothing is written. The guest keeps its own configuration</td></tr></tbody></table>
<p>On Ubuntu 17.10 and newer, the existing <code dir="auto">/etc/netplan</code> directory is moved aside to <code dir="auto">/etc/netplan-bkp</code> and replaced with a single generated file. Interfaces are renamed <code dir="auto">vj0</code>, <code dir="auto">vj1</code>, and so on, matched by MAC address. The netmask comes from what VMware Tools reported; if it is unknown, <code dir="auto">/24</code> is assumed.</p>
<aside aria-label="Caution" class="starlight-aside starlight-aside--caution"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 16C11.8022 16 11.6089 16.0587 11.4444 16.1686C11.28 16.2784 11.1518 16.4346 11.0761 16.6173C11.0004 16.8001 10.9806 17.0011 11.0192 17.1951C11.0578 17.3891 11.153 17.5673 11.2929 17.7071C11.4327 17.847 11.6109 17.9422 11.8049 17.9808C11.9989 18.0194 12.2 17.9996 12.3827 17.9239C12.5654 17.8482 12.7216 17.72 12.8315 17.5556C12.9413 17.3911 13 17.1978 13 17C13 16.7348 12.8946 16.4805 12.7071 16.2929C12.5196 16.1054 12.2652 16 12 16ZM22.67 17.47L14.62 3.47003C14.3598 3.00354 13.9798 2.61498 13.5192 2.3445C13.0586 2.07401 12.5341 1.9314 12 1.9314C11.4659 1.9314 10.9414 2.07401 10.4808 2.3445C10.0202 2.61498 9.64019 3.00354 9.38 3.47003L1.38 17.47C1.11079 17.924 0.966141 18.441 0.960643 18.9688C0.955144 19.4966 1.089 20.0166 1.34868 20.4761C1.60837 20.9356 1.9847 21.3185 2.43968 21.5861C2.89466 21.8536 3.41218 21.9964 3.94 22H20.06C20.5921 22.0053 21.1159 21.8689 21.5779 21.6049C22.0399 21.341 22.4234 20.9589 22.689 20.4978C22.9546 20.0368 23.0928 19.5134 23.0895 18.9814C23.0862 18.4493 22.9414 17.9277 22.67 17.47ZM20.94 19.47C20.8523 19.626 20.7245 19.7556 20.5697 19.8453C20.4149 19.935 20.2389 19.9815 20.06 19.98H3.94C3.76111 19.9815 3.5851 19.935 3.43032 19.8453C3.27553 19.7556 3.14765 19.626 3.06 19.47C2.97223 19.318 2.92602 19.1456 2.92602 18.97C2.92602 18.7945 2.97223 18.622 3.06 18.47L11.06 4.47003C11.1439 4.30623 11.2714 4.16876 11.4284 4.07277C11.5855 3.97678 11.766 3.92599 11.95 3.92599C12.134 3.92599 12.3145 3.97678 12.4716 4.07277C12.6286 4.16876 12.7561 4.30623 12.84 4.47003L20.89 18.47C20.9892 18.6199 21.0462 18.7937 21.055 18.9732C21.0638 19.1527 21.0241 19.3312 20.94 19.49V19.47ZM12 8.00003C11.7348 8.00003 11.4804 8.10538 11.2929 8.29292C11.1054 8.48046 11 8.73481 11 9.00003V13C11 13.2652 11.1054 13.5196 11.2929 13.7071C11.4804 13.8947 11.7348 14 12 14C12.2652 14 12.5196 13.8947 12.7071 13.7071C12.8946 13.5196 13 13.2652 13 13V9.00003C13 8.73481 12.8946 8.48046 12.7071 8.29292C12.5196 8.10538 12.2652 8.00003 12 8.00003Z"></path></svg>Caution</p><div class="starlight-aside__content"><p>On <strong>Ubuntu 17.10 and newer</strong> this rewrites the guest’s networking wholesale. A NIC that was on DHCP comes back statically pinned to the address it held at discovery time. If you want it to stay on DHCP, use <a href="#c--force-everything-onto-dhcp">Scenario C</a>.</p><p>On <strong>RHEL 7+, SUSE, other Linux, and Windows</strong>, nothing is written at all. If the conversion renamed the interface, the guest’s own configuration will point at a device that no longer exists. Have console access ready.</p><p>On a <strong>multi-homed VM</strong>, only one interface gets a default route, and which one is not predictable. Verify routing after migration.</p></div></aside>
<aside aria-label="Note" class="starlight-aside starlight-aside--note"><p class="starlight-aside__title" aria-hidden="true"><svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"><path d="M12 11C11.7348 11 11.4804 11.1054 11.2929 11.2929C11.1054 11.4804 11 11.7348 11 12V16C11 16.2652 11.1054 16.5196 11.2929 16.7071C11.4804 16.8946 11.7348 17 12 17C12.2652 17 12.5196 16.8946 12.7071 16.7071C12.8946 16.5196 13 16.2652 13 16V12C13 11.7348 12.8946 11.4804 12.7071 11.2929C12.5196 11.1054 12.2652 11 12 11ZM12.38 7.08C12.1365 6.97998 11.8635 6.97998 11.62 7.08C11.4973 7.12759 11.3851 7.19896 11.29 7.29C11.2017 7.3872 11.1306 7.49882 11.08 7.62C11.024 7.73868 10.9966 7.86882 11 8C10.9992 8.13161 11.0245 8.26207 11.0742 8.38391C11.124 8.50574 11.1973 8.61656 11.29 8.71C11.3872 8.79833 11.4988 8.86936 11.62 8.92C11.7715 8.98224 11.936 9.00632 12.099 8.99011C12.2619 8.97391 12.4184 8.91792 12.5547 8.82707C12.691 8.73622 12.8029 8.61328 12.8805 8.46907C12.9582 8.32486 12.9992 8.16378 13 8C12.9963 7.73523 12.8927 7.48163 12.71 7.29C12.6149 7.19896 12.5028 7.12759 12.38 7.08ZM12 2C10.0222 2 8.08879 2.58649 6.4443 3.6853C4.79981 4.78412 3.51809 6.3459 2.76121 8.17317C2.00433 10.0004 1.8063 12.0111 2.19215 13.9509C2.578 15.8907 3.53041 17.6725 4.92894 19.0711C6.32746 20.4696 8.10929 21.422 10.0491 21.8079C11.9889 22.1937 13.9996 21.9957 15.8268 21.2388C17.6541 20.4819 19.2159 19.2002 20.3147 17.5557C21.4135 15.9112 22 13.9778 22 12C22 10.6868 21.7413 9.38642 21.2388 8.17317C20.7363 6.95991 19.9997 5.85752 19.0711 4.92893C18.1425 4.00035 17.0401 3.26375 15.8268 2.7612C14.6136 2.25866 13.3132 2 12 2ZM12 20C10.4178 20 8.87104 19.5308 7.55544 18.6518C6.23985 17.7727 5.21447 16.5233 4.60897 15.0615C4.00347 13.5997 3.84504 11.9911 4.15372 10.4393C4.4624 8.88743 5.22433 7.46197 6.34315 6.34315C7.46197 5.22433 8.88743 4.4624 10.4393 4.15372C11.9911 3.84504 13.5997 4.00346 15.0615 4.60896C16.5233 5.21447 17.7727 6.23984 18.6518 7.55544C19.5308 8.87103 20 10.4177 20 12C20 14.1217 19.1572 16.1566 17.6569 17.6569C16.1566 19.1571 14.1217 20 12 20Z"></path></svg>Note</p><div class="starlight-aside__content"><p>Whether the source NIC was on DHCP or static is recorded but never acted on directly by vJailbreak. It matters only because it determines what the guest’s own untouched configuration says.</p></div></aside> </div> <footer class="sl-flex astro-3yyafb3n"> <div class="meta sl-flex astro-3yyafb3n"> <a href="https://platform9.github.io/vjailbreak/src/content/docs/guides/How-to/networking-101.md" class="sl-flex print:hidden astro-eez2twj6"><svg aria-hidden="true" class="astro-eez2twj6 astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.2em;"><path d="M22 7.24a1 1 0 0 0-.29-.71l-4.24-4.24a1 1 0 0 0-1.1-.22 1 1 0 0 0-.32.22l-2.83 2.83L2.29 16.05a1 1 0 0 0-.29.71V21a1 1 0 0 0 1 1h4.24a1 1 0 0 0 .76-.29l10.87-10.93L21.71 8c.1-.1.17-.2.22-.33a1 1 0 0 0 0-.24v-.14l.07-.05ZM6.83 20H4v-2.83l9.93-9.93 2.83 2.83L6.83 20ZM18.17 8.66l-2.83-2.83 1.42-1.41 2.82 2.82-1.41 1.42Z"/></svg> Edit page</a> </div> <div class="pagination-links print:hidden astro-u2l5gyhi" dir="ltr"> <a href="/vjailbreak/guides/how-to/network-traffic-separation/" rel="prev" class="astro-u2l5gyhi"> <svg aria-hidden="true" class="astro-u2l5gyhi astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.5rem;"><path d="M17 11H9.41l3.3-3.29a1.004 1.004 0 1 0-1.42-1.42l-5 5a1 1 0 0 0-.21.33 1 1 0 0 0 0 .76 1 1 0 0 0 .21.33l5 5a1.002 1.002 0 0 0 1.639-.325 1 1 0 0 0-.219-1.095L9.41 13H17a1 1 0 0 0 0-2Z"/></svg> <span class="astro-u2l5gyhi"> Previous <br class="astro-u2l5gyhi"> <span class="link-title astro-u2l5gyhi">Configuring Dedicated Data Network for Migrations</span> </span> </a> <a href="/vjailbreak/guides/how-to/ntp_timezone/" rel="next" class="astro-u2l5gyhi"> <svg aria-hidden="true" class="astro-u2l5gyhi astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.5rem;"><path d="M17.92 11.62a1.001 1.001 0 0 0-.21-.33l-5-5a1.003 1.003 0 1 0-1.42 1.42l3.3 3.29H7a1 1 0 0 0 0 2h7.59l-3.3 3.29a1.002 1.002 0 0 0 .325 1.639 1 1 0 0 0 1.095-.219l5-5a1 1 0 0 0 .21-.33 1 1 0 0 0 0-.76Z"/></svg> <span class="astro-u2l5gyhi"> Next <br class="astro-u2l5gyhi"> <span class="link-title astro-u2l5gyhi">Configure Time Zone and NTP Servers</span> </span> </a> </div> </footer> </div> </div> </main> </div> </div> </div> </div> </body></html>