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<base href="https://bugzilla.netfilter.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Conntrack marks ICMPv6 multicast and anycast ping responces as invalid."
href="https://bugzilla.netfilter.org/show_bug.cgi?id=1447">1447</a>
</td>
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<th>Summary</th>
<td>Conntrack marks ICMPv6 multicast and anycast ping responces as invalid.
</td>
</tr>
<tr>
<th>Product</th>
<td>netfilter/iptables
</td>
</tr>
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<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>other
</td>
</tr>
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<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>nf_conntrack
</td>
</tr>
<tr>
<th>Assignee</th>
<td>netfilter-buglog@lists.netfilter.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>igo9586@yandex.ru
</td>
</tr></table>
<p>
<div>
<pre>For example:
ping ff02::1%interface # ping all nodes on the link
ping ff02::2%interface # ping all routers on the link
ping ff05::2 # ping all nodes in ULA
ping fd00:: # anycast ping the ULA
In all these cases the conntrack expects the responces to be from the same
address as ping request, however, the responces will come from a different
addresses.
For example, the link local multicasts will receive reply from fe80::/10 range
(example fe80::aaaa:bbbb:cccc:dddd).
This causes an issue if you have conntrack setup to drop invalid packets. (`ct
state invalid drop` in nftables)</pre>
</div>
</p>
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