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<base href="https://bugzilla.netfilter.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - can not reuse source port to a DNATed IP if it is being used by another connection"
href="https://bugzilla.netfilter.org/show_bug.cgi?id=1427">1427</a>
</td>
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<tr>
<th>Summary</th>
<td>can not reuse source port to a DNATed IP if it is being used by another connection
</td>
</tr>
<tr>
<th>Product</th>
<td>netfilter/iptables
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>x86_64
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P5
</td>
</tr>
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<th>Component</th>
<td>NAT
</td>
</tr>
<tr>
<th>Assignee</th>
<td>netfilter-buglog@lists.netfilter.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>antonio.ojea.garcia@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Scenario:
There is one established connection IP1:Port1 -> IP2:Port2
There is a DNAT rule like IP3:Port3 -> IP2:Port2
If a new connection is created from IP1 to IP3:Port3,
and this connection has source port Port1,
the connection can not be established,
because the incoming packet is not de-natted
The bug was originally reported in Kubernetes:
<a href="https://github.com/kubernetes/kubernetes/issues/90258">https://github.com/kubernetes/kubernetes/issues/90258</a>
but I was able to reproduce it here:
<a href="https://gist.github.com/aojea/4ffb520db9f72de21685294d8fec7f33">https://gist.github.com/aojea/4ffb520db9f72de21685294d8fec7f33</a></pre>
</div>
</p>
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