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<h1 id="configure-nat64-dns-records">Configure NAT64 DNS Records<a class="headerlink" href="#configure-nat64-dns-records" title="Permanent link">&para;</a></h1>
<p>Some NAT64 configurations are entirely handled outside the Kubernetes cluster, therefore Kubernetes does not know anything about the associated IPv4 addresses. ExternalDNS should also be able to create A records for those cases.<br />
Therefore, we can configure <code>nat64-networks</code>, which <strong>must</strong> be a /96 network. You can also specify multiple <code>nat64-networks</code> for more complex setups.<br />
This creates an additional A record with a NAT64-translated IPv4 address for each AAAA record pointing to an IPv6 address within the given <code>nat64-networks</code>.</p>
<p>This can be configured with the following flag passed to the operator binary. You can also pass multiple <code>nat64-networks</code> by using a comma as seperator.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>--nat64-networks<span class="o">=</span><span class="s2">&quot;2001:db8:96::/96&quot;</span>
</code></pre></div>
<h2 id="setup-example">Setup Example<a class="headerlink" href="#setup-example" title="Permanent link">&para;</a></h2>
<p>We use an external NAT64 resolver and SIIT (Stateless IP/ICMP Translation). Therefore, our nodes only have IPv6 IP adresses but can reach IPv4 addresses <em>and</em> can be reached via IPv4.<br />
Outgoing connections are a classic NAT64 setup, where all IPv6 addresses gets translated to a small pool of IPv4 addresses.<br />
Incoming connnections are mapped on a different IPv4 pool, e.g. <code>198.51.100.0/24</code>, which can get translated one-to-one to IPv6 addresses.<br />
We dedicate a <code>/96</code> network for this, for example <code>2001:db8:96::/96</code>, so <code>198.51.100.0/24</code> can translated to <code>2001:db8:96::c633:6400/120</code>. Note: <code>/120</code> IPv6 network has exactly as many IP addresses as <code>/24</code> IPv4 network.</p>
<p>Therefore, the <code>/96</code> network can be configured as <code>nat64-networks</code>. This means, that <code>2001:0DB8:96::198.51.100.10</code> or <code>2001:db8:96::c633:640a</code> can be translated to <code>198.51.100.10</code>.<br />
Any source can point a record to an IPv6 address within the given <code>nat64-networks</code>, for example <code>2001:db8:96::c633:640a</code>.<br />
This creates by default an AAAA record and - if <code>nat64-networks</code> is configured - also an A record with <code>198.51.100.10</code> as target.</p>
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