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<h1 id="derp-configuration">DERP Configuration</h1>
<p>DERP (Designated Encrypted Relay for Packets) servers are relay servers that help Tailscale clients establish connections when direct connections aren't possible due to NAT, firewalls, or other network impediments. ionscale provides flexible DERP configuration options to support various deployment scenarios.</p>
<h2 id="embedded-derp-server">Embedded DERP Server</h2>
<p>ionscale includes a built-in DERP server that is enabled by default. This provides an out-of-the-box relay solution without requiring additional infrastructure.</p>
<h3 id="configuration">Configuration</h3>
<p>The embedded DERP server can be configured in your ionscale configuration file:</p>
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="nt">derp</span><span class="p">:</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="w"> </span><span class="nt">server</span><span class="p">:</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="w"> </span><span class="nt">disabled</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span><span class="w"> </span><span class="c1"># Set to true to disable the embedded DERP server</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="nt">region_id</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1000</span><span class="w"> </span><span class="c1"># The region ID for the embedded DERP server</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="w"> </span><span class="nt">region_code</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;ionscale&quot;</span><span class="w"> </span><span class="c1"># The region code (short name)</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="w"> </span><span class="nt">region_name</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;ionscale</span><span class="nv"> </span><span class="s">Embedded</span><span class="nv"> </span><span class="s">DERP&quot;</span><span class="w"> </span><span class="c1"># Human-readable region name</span>
</span></code></pre></div>
<p>Additional networking parameters that affect the DERP server:</p>
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="c1"># The HTTP(S) listen address for the control plane (also used for DERP)</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="nt">listen_addr</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;:8080&quot;</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="c1"># The STUN listen address when using the embedded DERP</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="nt">stun_listen_addr</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;:3478&quot;</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="c1"># The DNS name of the server HTTP(S) endpoint as accessible by clients</span>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="nt">public_addr</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;ionscale.example.com:443&quot;</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="c1"># The DNS name of the STUN endpoint as accessible by clients</span>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="nt">stun_public_addr</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;ionscale.example.com:3478&quot;</span>
</span></code></pre></div>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>For the embedded DERP server to function properly, clients must be able to reach your ionscale server at the configured <code>public_addr</code> and <code>stun_public_addr</code>. Ensure these addresses are publicly accessible and have the appropriate ports open in your firewall.</p>
</div>
<h2 id="external-derp-sources">External DERP Sources</h2>
<p>In addition to or instead of the embedded DERP server, ionscale can use external DERP servers. This is useful for:</p>
<ul>
<li>Using Tailscale's global DERP infrastructure</li>
<li>Setting up your own geographically distributed DERP servers</li>
<li>Optimizing connection paths for globally distributed teams</li>
</ul>
<p>To configure external DERP sources:</p>
<div class="language-yaml highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="nt">derp</span><span class="p">:</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="w"> </span><span class="nt">sources</span><span class="p">:</span>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">https://controlplane.tailscale.com/derpmap/default</span><span class="w"> </span><span class="c1"># Tailscale&#39;s default DERP map</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">https://example.com/my-custom-derpmap.json</span><span class="w"> </span><span class="c1"># Custom DERP map</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">git::https://github.com/example/derpmap//config.json</span><span class="w"> </span><span class="c1"># From a git repository</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">file:///etc/ionscale/derpmaps/custom.json</span><span class="w"> </span><span class="c1"># From a local file</span>
</span></code></pre></div>
<p>The <code>derp.sources</code> field accepts a list of URLs that point to JSON files containing DERP map configurations. These sources are loaded at server startup and merged with the embedded DERP configuration (if enabled).</p>
<div class="admonition info">
<p class="admonition-title">Source locations</p>
<p>ionscale uses HashiCorp's <a href="https://github.com/hashicorp/go-getter">go-getter</a> library to fetch external sources, which supports multiple protocols and source types:</p>
<ul>
<li><strong>HTTP/HTTPS</strong>: <code>https://example.com/derpmap.json</code></li>
<li><strong>Local files</strong>: <code>file:///path/to/derpmap.json</code></li>
<li><strong>Git repositories</strong>: <code>git::https://github.com/user/repo//path/to/file.json</code></li>
<li><strong>S3 buckets</strong>: <code>s3::https://s3.amazonaws.com/bucket/derpmap.json</code></li>
<li><strong>GCS buckets</strong>: <code>gcs::https://www.googleapis.com/storage/v1/bucket/derpmap.json</code></li>
</ul>
<p>This flexibility allows you to store and manage your DERP maps in various locations based on your organization's needs.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>At the time of writing, ionscale only loads external DERP sources at startup and does not automatically poll them for changes. To apply changes to external DERP sources, you will need to restart the ionscale server.</p>
</div>
<h2 id="instance-and-tailnet-derp-configuration">Instance and Tailnet DERP Configuration</h2>
<p>ionscale provides a flexible DERP configuration model:</p>
<h3 id="default-instance-configuration">Default Instance Configuration</h3>
<p>By default, all tailnets use the DERP map defined at the instance level, which includes:</p>
<ul>
<li>The embedded DERP server (if enabled)</li>
<li>Any external DERP sources configured in your ionscale configuration file</li>
</ul>
<p>You can view the instance-level DERP map with:</p>
<div class="language-bash highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>ionscale<span class="w"> </span>system<span class="w"> </span>get-derp-map<span class="w"> </span><span class="o">[</span>--json<span class="o">]</span>
</span></code></pre></div>
<h3 id="tailnet-specific-configuration">Tailnet-Specific Configuration</h3>
<p>Each tailnet can be configured with its own custom DERP map. This gives you the flexibility to:</p>
<ul>
<li>Provide optimized DERP configurations for teams in different regions</li>
<li>Test new DERP setups on specific tailnets before broader deployment</li>
<li>Create specialized network paths for particular use cases</li>
</ul>
<p>When a tailnet doesn't have a custom DERP map configured, it automatically uses the instance's default DERP map.</p>
<p>Managing tailnet-specific DERP maps:</p>
<div class="language-bash highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="c1"># View a tailnet&#39;s current DERP map</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>ionscale<span class="w"> </span>tailnets<span class="w"> </span>get-derp-map<span class="w"> </span>--tailnet<span class="w"> </span>&lt;tailnet-id&gt;<span class="w"> </span><span class="o">[</span>--json<span class="o">]</span>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a>
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="c1"># Set a custom DERP map for a specific tailnet</span>
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a>ionscale<span class="w"> </span>tailnets<span class="w"> </span>set-derp-map<span class="w"> </span>--tailnet<span class="w"> </span>&lt;tailnet-id&gt;<span class="w"> </span>--file<span class="w"> </span>&lt;derpmap.json&gt;
</span><span id="__span-4-6"><a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a>
</span><span id="__span-4-7"><a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a><span class="c1"># Remove the custom configuration and revert to the instance default</span>
</span><span id="__span-4-8"><a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a>ionscale<span class="w"> </span>tailnets<span class="w"> </span>reset-derp-map<span class="w"> </span>--tailnet<span class="w"> </span>&lt;tailnet-id&gt;
</span></code></pre></div>
<h2 id="creating-custom-derp-maps">Creating Custom DERP Maps</h2>
<p>A DERP map is a JSON structure containing regions and nodes. Here's an example:</p>
<div class="language-json highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="p">{</span>
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a><span class="w"> </span><span class="nt">&quot;Regions&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="w"> </span><span class="nt">&quot;1&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a><span class="w"> </span><span class="nt">&quot;RegionID&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span>
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="w"> </span><span class="nt">&quot;RegionCode&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;nyc&quot;</span><span class="p">,</span>
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="w"> </span><span class="nt">&quot;RegionName&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;New York City&quot;</span><span class="p">,</span>
</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a><span class="w"> </span><span class="nt">&quot;Nodes&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
</span><span id="__span-5-8"><a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a><span class="w"> </span><span class="p">{</span>
</span><span id="__span-5-9"><a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a><span class="w"> </span><span class="nt">&quot;Name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;1a&quot;</span><span class="p">,</span>
</span><span id="__span-5-10"><a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codelineno-5-10"></a><span class="w"> </span><span class="nt">&quot;RegionID&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span>
</span><span id="__span-5-11"><a id="__codelineno-5-11" name="__codelineno-5-11" href="#__codelineno-5-11"></a><span class="w"> </span><span class="nt">&quot;HostName&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;derp1.example.com&quot;</span><span class="p">,</span>
</span><span id="__span-5-12"><a id="__codelineno-5-12" name="__codelineno-5-12" href="#__codelineno-5-12"></a><span class="w"> </span><span class="nt">&quot;DERPPort&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">443</span><span class="p">,</span>
</span><span id="__span-5-13"><a id="__codelineno-5-13" name="__codelineno-5-13" href="#__codelineno-5-13"></a><span class="w"> </span><span class="nt">&quot;STUNPort&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">3478</span>
</span><span id="__span-5-14"><a id="__codelineno-5-14" name="__codelineno-5-14" href="#__codelineno-5-14"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-5-15"><a id="__codelineno-5-15" name="__codelineno-5-15" href="#__codelineno-5-15"></a><span class="w"> </span><span class="p">]</span>
</span><span id="__span-5-16"><a id="__codelineno-5-16" name="__codelineno-5-16" href="#__codelineno-5-16"></a><span class="w"> </span><span class="p">},</span>
</span><span id="__span-5-17"><a id="__codelineno-5-17" name="__codelineno-5-17" href="#__codelineno-5-17"></a><span class="w"> </span><span class="nt">&quot;2&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-5-18"><a id="__codelineno-5-18" name="__codelineno-5-18" href="#__codelineno-5-18"></a><span class="w"> </span><span class="nt">&quot;RegionID&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span>
</span><span id="__span-5-19"><a id="__codelineno-5-19" name="__codelineno-5-19" href="#__codelineno-5-19"></a><span class="w"> </span><span class="nt">&quot;RegionCode&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;sfo&quot;</span><span class="p">,</span>
</span><span id="__span-5-20"><a id="__codelineno-5-20" name="__codelineno-5-20" href="#__codelineno-5-20"></a><span class="w"> </span><span class="nt">&quot;RegionName&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;San Francisco&quot;</span><span class="p">,</span>
</span><span id="__span-5-21"><a id="__codelineno-5-21" name="__codelineno-5-21" href="#__codelineno-5-21"></a><span class="w"> </span><span class="nt">&quot;Nodes&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
</span><span id="__span-5-22"><a id="__codelineno-5-22" name="__codelineno-5-22" href="#__codelineno-5-22"></a><span class="w"> </span><span class="p">{</span>
</span><span id="__span-5-23"><a id="__codelineno-5-23" name="__codelineno-5-23" href="#__codelineno-5-23"></a><span class="w"> </span><span class="nt">&quot;Name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;2a&quot;</span><span class="p">,</span>
</span><span id="__span-5-24"><a id="__codelineno-5-24" name="__codelineno-5-24" href="#__codelineno-5-24"></a><span class="w"> </span><span class="nt">&quot;RegionID&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span>
</span><span id="__span-5-25"><a id="__codelineno-5-25" name="__codelineno-5-25" href="#__codelineno-5-25"></a><span class="w"> </span><span class="nt">&quot;HostName&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;derp2.example.com&quot;</span><span class="p">,</span>
</span><span id="__span-5-26"><a id="__codelineno-5-26" name="__codelineno-5-26" href="#__codelineno-5-26"></a><span class="w"> </span><span class="nt">&quot;DERPPort&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">443</span><span class="p">,</span>
</span><span id="__span-5-27"><a id="__codelineno-5-27" name="__codelineno-5-27" href="#__codelineno-5-27"></a><span class="w"> </span><span class="nt">&quot;STUNPort&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">3478</span>
</span><span id="__span-5-28"><a id="__codelineno-5-28" name="__codelineno-5-28" href="#__codelineno-5-28"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-5-29"><a id="__codelineno-5-29" name="__codelineno-5-29" href="#__codelineno-5-29"></a><span class="w"> </span><span class="p">]</span>
</span><span id="__span-5-30"><a id="__codelineno-5-30" name="__codelineno-5-30" href="#__codelineno-5-30"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-5-31"><a id="__codelineno-5-31" name="__codelineno-5-31" href="#__codelineno-5-31"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-5-32"><a id="__codelineno-5-32" name="__codelineno-5-32" href="#__codelineno-5-32"></a><span class="p">}</span>
</span></code></pre></div>
<p>Important fields:</p>
<ul>
<li><code>RegionID</code>: A unique identifier for the region (1-999 for custom regions, 1000+ reserved for ionscale)</li>
<li><code>RegionCode</code>: A short code for the region (e.g., "nyc", "sfo")</li>
<li><code>RegionName</code>: A human-readable name for the region</li>
<li><code>Nodes</code>: A list of DERP servers in the region</li>
<li><code>Name</code>: A unique name for the node within the region</li>
<li><code>HostName</code>: The DNS name of the DERP server</li>
<li><code>DERPPort</code>: The port for DERP traffic (typically 443)</li>
<li><code>STUNPort</code>: The port for STUN traffic (typically 3478)</li>
</ul>
<p>To apply a custom DERP map to a tailnet:</p>
<div class="language-bash highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="c1"># Create the DERP map file</span>
</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a>cat<span class="w"> </span>&gt;<span class="w"> </span>my-derpmap.json<span class="w"> </span><span class="s">&lt;&lt;EOF</span>
</span><span id="__span-6-3"><a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a><span class="s">{</span>
</span><span id="__span-6-4"><a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a><span class="s"> &quot;Regions&quot;: {</span>
</span><span id="__span-6-5"><a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a><span class="s"> &quot;1&quot;: {</span>
</span><span id="__span-6-6"><a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a><span class="s"> &quot;RegionID&quot;: 1,</span>
</span><span id="__span-6-7"><a id="__codelineno-6-7" name="__codelineno-6-7" href="#__codelineno-6-7"></a><span class="s"> &quot;RegionCode&quot;: &quot;custom&quot;,</span>
</span><span id="__span-6-8"><a id="__codelineno-6-8" name="__codelineno-6-8" href="#__codelineno-6-8"></a><span class="s"> &quot;RegionName&quot;: &quot;My Custom DERP&quot;,</span>
</span><span id="__span-6-9"><a id="__codelineno-6-9" name="__codelineno-6-9" href="#__codelineno-6-9"></a><span class="s"> &quot;Nodes&quot;: [</span>
</span><span id="__span-6-10"><a id="__codelineno-6-10" name="__codelineno-6-10" href="#__codelineno-6-10"></a><span class="s"> {</span>
</span><span id="__span-6-11"><a id="__codelineno-6-11" name="__codelineno-6-11" href="#__codelineno-6-11"></a><span class="s"> &quot;Name&quot;: &quot;derp1&quot;,</span>
</span><span id="__span-6-12"><a id="__codelineno-6-12" name="__codelineno-6-12" href="#__codelineno-6-12"></a><span class="s"> &quot;RegionID&quot;: 1,</span>
</span><span id="__span-6-13"><a id="__codelineno-6-13" name="__codelineno-6-13" href="#__codelineno-6-13"></a><span class="s"> &quot;HostName&quot;: &quot;derp.example.com&quot;,</span>
</span><span id="__span-6-14"><a id="__codelineno-6-14" name="__codelineno-6-14" href="#__codelineno-6-14"></a><span class="s"> &quot;DERPPort&quot;: 443,</span>
</span><span id="__span-6-15"><a id="__codelineno-6-15" name="__codelineno-6-15" href="#__codelineno-6-15"></a><span class="s"> &quot;STUNPort&quot;: 3478</span>
</span><span id="__span-6-16"><a id="__codelineno-6-16" name="__codelineno-6-16" href="#__codelineno-6-16"></a><span class="s"> }</span>
</span><span id="__span-6-17"><a id="__codelineno-6-17" name="__codelineno-6-17" href="#__codelineno-6-17"></a><span class="s"> ]</span>
</span><span id="__span-6-18"><a id="__codelineno-6-18" name="__codelineno-6-18" href="#__codelineno-6-18"></a><span class="s"> }</span>
</span><span id="__span-6-19"><a id="__codelineno-6-19" name="__codelineno-6-19" href="#__codelineno-6-19"></a><span class="s"> }</span>
</span><span id="__span-6-20"><a id="__codelineno-6-20" name="__codelineno-6-20" href="#__codelineno-6-20"></a><span class="s">}</span>
</span><span id="__span-6-21"><a id="__codelineno-6-21" name="__codelineno-6-21" href="#__codelineno-6-21"></a><span class="s">EOF</span>
</span><span id="__span-6-22"><a id="__codelineno-6-22" name="__codelineno-6-22" href="#__codelineno-6-22"></a>
</span><span id="__span-6-23"><a id="__codelineno-6-23" name="__codelineno-6-23" href="#__codelineno-6-23"></a><span class="c1"># Apply it to a tailnet</span>
</span><span id="__span-6-24"><a id="__codelineno-6-24" name="__codelineno-6-24" href="#__codelineno-6-24"></a>ionscale<span class="w"> </span>tailnets<span class="w"> </span>set-derp-map<span class="w"> </span>--tailnet<span class="w"> </span>&lt;tailnet-id&gt;<span class="w"> </span>--file<span class="w"> </span>my-derpmap.json
</span></code></pre></div>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>DERP servers primarily help with establishing connections when direct peer-to-peer connections aren't possible. Having DERP servers geographically close to your users can improve connection establishment times and provide better fallback performance.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Changes to DERP maps are automatically distributed to clients during their regular polling. There's no need to manually update clients when changing DERP configurations.</p>
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