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<body><span class="vcard"><a class="email" href="mailto:fw@strlen.de" title="Florian Westphal <fw@strlen.de>"> <span class="fn">Florian Westphal</span></a>
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<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - 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">bug 1427</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>FIXED
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - 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#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - 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">bug 1427</a>
from <span class="vcard"><a class="email" href="mailto:fw@strlen.de" title="Florian Westphal <fw@strlen.de>"> <span class="fn">Florian Westphal</span></a>
</span></b>
<pre>This is caused by bad interaction between TCP early demux and the NAT engine.
Test case works with "sysctl net.ipv4.tcp_early_demux=0"
patch to detect this case & undo the wrong lookup:
<a href="https://patchwork.ozlabs.org/project/netfilter-devel/patch/20210224162321.4899-2-fw@strlen.de/">https://patchwork.ozlabs.org/project/netfilter-devel/patch/20210224162321.4899-2-fw@strlen.de/</a></pre>
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