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24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/features"><span itemprop="name">Features</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Route Synchronization</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Route Synchronization</h1>
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<p>The route synchronization feature keeps the kernel routing table in sync with WireGuard's <em>AllowedIPs</em> setting.</p>
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<p>This synchronization is bi-directional:</p>
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<ul>
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<li>Networks with are found in a Peers AllowedIP list will be installed as a kernel route.</li>
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<li>Kernel routes with the peers link-local IP address as next-hop will be added to the Peers <em>AllowedIPs</em> list.</li>
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</ul>
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<p>This rather simple feature allows user to pair cunicu with a software routing daemon like <a href="https://bird.network.cz/" target="_blank" rel="noopener noreferrer">Bird2</a> while using a single WireGuard interface with multiple peer-to-peer links.</p>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="configuration">Configuration<a class="hash-link" aria-label="Direct link to Configuration" title="Direct link to Configuration" href="/docs/features/rtsync#configuration"></a></h2>
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<p>The following settings can be used in the main section of the <a href="/docs/config">configuration file</a> or with-in the <code>interfaces</code> section to customize settings of an individual interface.</p>
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<!-- -->
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<div class="redocusaurus redocusaurus-schema hide-example"><div class="sc-eCstZk eGHUfI"><div class="sc-iBPTVF iKpLUv"><div class="sc-hKgKIp kwuQOC"><table class="sc-hHftZz gwKXaW"><tbody><tr><td kind="field" title="sync_routes" class="sc-hBEZvw sc-fFubCH buyQWa dNjbQz"><span class="sc-idOjMB imcswj"></span><span class="property-name">sync_routes</span></td><td class="sc-bkzXAi hgmEWl"><div><div><span class="sc-gTgyBf sc-laRQQM bDVBYe GbFxg"></span><span class="sc-gTgyBf sc-iNqNmV bDVBYe lbENXf">boolean</span><span class="sc-gTgyBf sc-jeGSXX bDVBYe cgiATn"> (<!-- -->Route Synchronization<!-- -->) </span></div><div><span class="sc-gTgyBf bDVBYe"> <!-- -->Default:<!-- --> </span> <span class="sc-gTgyBf sc-lcuiaG bDVBYe hkaQSL">true</span></div> <div><div html="<p>Enable route synchronization.</p>
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" class="sc-iJuWdM sc-cBNeRQ czxMmN iNyBBQ"><p>Enable route synchronization.</p>
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</div></div></div></td></tr><tr><td kind="field" title="routing_table" class="sc-hBEZvw sc-fFubCH buyQWa dNjbQz"><span class="sc-idOjMB imcswj"></span><span class="property-name">routing_table</span></td><td class="sc-bkzXAi hgmEWl"><div><div><span class="sc-gTgyBf sc-laRQQM bDVBYe GbFxg"></span><span class="sc-gTgyBf sc-iNqNmV bDVBYe lbENXf">integer</span><span class="sc-gTgyBf sc-jeGSXX bDVBYe cgiATn"> (<!-- -->Kernel Routing Table<!-- -->) </span></div><div><span class="sc-gTgyBf bDVBYe"> <!-- -->Default:<!-- --> </span> <span class="sc-gTgyBf sc-lcuiaG bDVBYe hkaQSL">254</span></div> <div><div html="<p>Kernel routing table which is used.
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On Linux, see <code>/etc/iproute2/rt_tables</code> for table ids and names</p>
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" class="sc-iJuWdM sc-cBNeRQ czxMmN iNyBBQ"><p>Kernel routing table which is used.
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On Linux, see <code>/etc/iproute2/rt_tables</code> for table ids and names</p>
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</div></div></div></td></tr><tr class="last"><td kind="field" title="watch_routes" class="sc-hBEZvw sc-fFubCH buyQWa dNjbQz"><span class="sc-idOjMB imcswj"></span><span class="property-name">watch_routes</span></td><td class="sc-bkzXAi hgmEWl"><div><div><span class="sc-gTgyBf sc-laRQQM bDVBYe GbFxg"></span><span class="sc-gTgyBf sc-iNqNmV bDVBYe lbENXf">boolean</span><span class="sc-gTgyBf sc-jeGSXX bDVBYe cgiATn"> (<!-- -->Watch Routes<!-- -->) </span></div><div><span class="sc-gTgyBf bDVBYe"> <!-- -->Default:<!-- --> </span> <span class="sc-gTgyBf sc-lcuiaG bDVBYe hkaQSL">true</span></div> <div><div html="<p>Keep watching the for changes in the kernel routing table via netlink multicast group.</p>
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" class="sc-iJuWdM sc-cBNeRQ czxMmN iNyBBQ"><p>Keep watching the for changes in the kernel routing table via netlink multicast group.</p>
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</div></div></div></td></tr></tbody></table></div><div class="sc-jSguLX sc-gKsecS cRCTYQ jcMixq"><div class="sc-jONmMj cycZBR"><div class="sc-hTZhMB kTaCsY"><div class="sc-cTkyaV ebyfmT"><div class="sc-giInvV cIuwxG"><button><div class="sc-jcVcfa iVrxDL">Copy</div></button></div><div class="sc-iJuWdM czxMmN sc-jNMdxs elJqcE"><div class="redoc-json"><code><button class="collapser" aria-label="collapse"></button><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable"><span class="property token string">"sync_routes"</span>: <span class="token boolean">true</span><span class="token punctuation">,</span></div></li><li><div class="hoverable"><span class="property token string">"routing_table"</span>: <span class="token number">254</span><span class="token punctuation">,</span></div></li><li><div class="hoverable"><span class="property token string">"watch_routes"</span>: <span class="token boolean">true</span></div></li></ul><span class="token punctuation">}</span></code></div></div></div></div></div></div></div></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a href="https://github.com/cunicu/cunicu/edit/main/docs/features/rtsync.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/features/pske"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Pre-shared Key Establishment</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/usage"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Usage</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a class="table-of-contents__link toc-highlight" href="/docs/features/rtsync#configuration">Configuration</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Documentation</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/docs">Tutorial</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/legal">Legal</a></li></ul></div><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://discuss.cunicu.li" target="_blank" rel="noopener noreferrer" class="footer__link-item">Forum<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://fosstodon.org/@cunicu" target="_blank" rel="noopener noreferrer" class="footer__link-item">Fediverse<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li></ul></div><div class="col footer__col"><div class="footer__title">More</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/blog">Blog</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/contact">Contact</a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2025 Steffen Vogel.</div></div></div></footer></div>
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