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<article class="md-content__inner md-typeset">
<!-- clone me -->
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="nn">---</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="nt">title</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;Proposal:</span><span class="nv"> </span><span class="s">Rollback</span><span class="nv"> </span><span class="s">IPv6</span><span class="nv"> </span><span class="s">internal</span><span class="nv"> </span><span class="s">Node</span><span class="nv"> </span><span class="s">IP</span><span class="nv"> </span><span class="s">exposure&quot;</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="nt">version</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">if applicable</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="nt">authors</span><span class="p">:</span><span class="w"> </span><span class="err">@</span><span class="l l-Scalar l-Scalar-Plain">ivankatliarchuk, @szuecs, @mloiseleur</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="nt">creation-date</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">2025-01-01</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="nt">status</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">approved</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="nn">---</span>
</code></pre></div>
<h1 id="introduce-feature-flag-for-ipv6-internal-node-ip-handling-in-external-dns-and-change-the-behavior">Introduce Feature Flag for IPv6 Internal Node IP Handling in &lsquo;&rsquo;external-dns&rsquo;&rsquo; and Change the behavior<a class="headerlink" href="#introduce-feature-flag-for-ipv6-internal-node-ip-handling-in-external-dns-and-change-the-behavior" title="Permanent link">&para;</a></h1>
<h2 id="summary">Summary<a class="headerlink" href="#summary" title="Permanent link">&para;</a></h2>
<p>This proposal aims to introduce a feature flag in &lsquo;external-dns&rsquo; to control the handling of IPv6 internal node IPs.<br />
In the current version, the feature flag will default to the existing behavior. In the next <code>minor</code> or <code>minor+N</code> version, the default behavior will be reversed, encouraging users to adopt the new behavior while providing a transition period.</p>
<h2 id="motivation">Motivation<a class="headerlink" href="#motivation" title="Permanent link">&para;</a></h2>
<p>The discussion in <a href="https://github.com/kubernetes-sigs/external-dns/issues/4566">issue#4566</a> and the<br />
subsequent <a href="https://github.com/kubernetes-sigs/external-dns/pull/4574">pr#4574</a> and <a href="https://github.com/kubernetes-sigs/external-dns/pull/4808">pr#4808</a> highlighted concerns regarding the treatment of IPv6 internal node IPs.<br />
To address these concerns without causing immediate disruption, a feature flag will allow users to opt-out the current behavior, providing flexibility during the transition.</p>
<h2 id="goals">Goals<a class="headerlink" href="#goals" title="Permanent link">&para;</a></h2>
<ul>
<li>Introduce feature to toggle the handling of IPv6 internal node IPs</li>
</ul>
<h2 id="non-goals">Non-Goals<a class="headerlink" href="#non-goals" title="Permanent link">&para;</a></h2>
<ul>
<li><strong><em>Propose/Add an annotation for this specific use case</em></strong></li>
<li>Provide support for <code>external-dns.alpha.kubernetes.io/expose-internal-ipv6</code> in follow-up releases.</li>
<li>Managing dual annotation and flag may introduce complexity.</li>
</ul>
<h2 id="proposal">Proposal<a class="headerlink" href="#proposal" title="Permanent link">&para;</a></h2>
<ul>
<li><strong><em>Introduce Feature Flag</em></strong></li>
<li>Add a feature flag, e.g., <code>--expose-internal-ipv6=true</code>, to control the handling of IPv6 internal node IPs.</li>
<li>
<p>In the current version, this flag will default to <code>true</code>, maintaining the existing behavior.</p>
</li>
<li>
<p><strong><em>Flip Default Behavior in Next Minor Version</em></strong></p>
</li>
<li>In the subsequent minor release, change the default value of <code>--expose-internal-ipv6</code> to <code>false</code>, adopting the new behavior by default.</li>
<li>Users can still override this behavior by explicitly setting the flag as needed.</li>
</ul>
<p>Proposed Changes in <code>source/node.go</code> file.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="c1">// IPv6 addresses are labeled as NodeInternalIP despite being usable externally as well.</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="k">if</span><span class="w"> </span><span class="nx">addr</span><span class="p">.</span><span class="nx">Type</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="nx">v1</span><span class="p">.</span><span class="nx">NodeInternalIP</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="nx">ns</span><span class="p">.</span><span class="nx">exposeInternalIP</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="o">...</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span><span class="nx">pv6Addresses</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nb">append</span><span class="p">(</span><span class="nx">ipv6Addresses</span><span class="p">,</span><span class="w"> </span><span class="nx">addr</span><span class="p">.</span><span class="nx">Address</span><span class="p">)</span>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="p">}</span>
</code></pre></div>
<h2 id="user-stories">User Stories<a class="headerlink" href="#user-stories" title="Permanent link">&para;</a></h2>
<ul>
<li>
<p><strong>As a cluster Operator or Administrator</strong>, I want to control the handling of IPv6 internal node IPs to align with defined network topology and configuration.</p>
</li>
<li>
<p><strong>As a SecDevOps</strong>, I want to ensure that <code>external-dns</code> does not expose internal IPv6 node addresses via public DNS records, so that I can prevent unintended data leaks and reduce the attack surface of my Kubernetes cluster.</p>
</li>
<li>
<p><strong>As a SecDevOps</strong>, I want to use a feature flag to selectively enable or disable the new IPv6 behavior in <code>external-dns</code>, so that I can evaluate its security impact before it becomes the default setting in future releases.</p>
</li>
<li>
<p><strong>As a SecDevOps</strong>, I want to use a feature flag to selectively enable or disable the new IPv6 behavior in <code>external-dns</code>, so that I can detect misconfigurations, act on potential security incidents, and ensure compliance with security policies.</p>
</li>
</ul>
<h2 id="implementation-steps">Implementation Steps<a class="headerlink" href="#implementation-steps" title="Permanent link">&para;</a></h2>
<ul>
<li>Code Changes:</li>
<li>
<p>Implement the feature flag in the &lsquo;external-dns&rsquo; codebase to toggle the handling of IPv6 internal node IPs.</p>
</li>
<li>
<p>Documentation:</p>
</li>
<li>Update the &lsquo;external-dns&rsquo; documentation to include information about the feature flag, its purpose, and usage examples.</li>
</ul>
<h2 id="drawbacks">Drawbacks<a class="headerlink" href="#drawbacks" title="Permanent link">&para;</a></h2>
<ul>
<li>Introducing a feature flag adds complexity to the configuration and codebase.</li>
<li>Changing default behavior in a future release may still cause issues for users who are unaware of the change.</li>
</ul>
<h2 id="alternatives">Alternatives<a class="headerlink" href="#alternatives" title="Permanent link">&para;</a></h2>
<ul>
<li><strong><em>Immediate Behavior Change</em></strong></li>
<li>Directly change the behavior without a feature flag, which could lead to unexpected issues for users.</li>
<li><strong><em>No Change</em></strong></li>
<li>Maintain the current behavior, potentially leaving the concerns unaddressed.</li>
<li>Users may not be able to update an <code>external-dns</code> version due to security, compliance or any other concerns.</li>
</ul>
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