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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 - SNAT/DNAT/Masquerading not working for UDPLite protocol"
href="https://bugzilla.netfilter.org/show_bug.cgi?id=1448">1448</a>
</td>
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<th>Summary</th>
<td>SNAT/DNAT/Masquerading not working for UDPLite protocol
</td>
</tr>
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<th>Product</th>
<td>netfilter/iptables
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86_64
</td>
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<th>OS</th>
<td>other
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P5
</td>
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<th>Component</th>
<td>NAT
</td>
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<th>Assignee</th>
<td>netfilter-buglog@lists.netfilter.org
</td>
</tr>
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<th>Reporter</th>
<td>me@nicho1as.wang
</td>
</tr></table>
<p>
<div>
<pre>It was first observed on Arch Linux with a 5.7.10 kernel, serving as a router
with the following rules,
iptables -A POSTROUTING -t nat -o br-wan -j MASQUERADE
iptables -A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i br-lan -o br-wan -j ACCEPT
, and it seems the packet are NAT'd as a general IP packet (the server receives
a lan ip address).
Then I tried to add the following NAT rules but it cannot match to any packet.
iptables -I POSTROUTING 1 -tnat -j SNAT -p udplite -o br-wan --to [wan_ip]
iptables -I PREROUTING 1 -tnat -j DNAT -p udplite -i br-lan --to [lan_ip]
The tool I wrote for testing this behavior is hosted at
<a href="https://github.com/nicholascw/SLOWProxy/tree/develop/gadgets/udpliteping">https://github.com/nicholascw/SLOWProxy/tree/develop/gadgets/udpliteping</a>, which
is a simple ping-n-pong sketch.</pre>
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</p>
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