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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 - Bug in altering IP TTL field of a packet?"
href="https://bugzilla.netfilter.org/show_bug.cgi?id=1169">1169</a>
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<th>Summary</th>
<td>Bug in altering IP TTL field of a packet?
</td>
</tr>
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<th>Product</th>
<td>nftables
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P5
</td>
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<th>Component</th>
<td>nft
</td>
</tr>
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<th>Assignee</th>
<td>pablo@netfilter.org
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</tr>
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<th>Reporter</th>
<td>berend@kubusje.nl
</td>
</tr></table>
<p>
<div>
<pre>When I try to set the IP TTL field to a certain number with a rule it doesn't
change the TTL field but it changes the PROTO field.
This is the rule:
oifname eno2 ip daddr 136.144.X.X ip ttl 1-63 ip ttl set 64 nftrace set 1 log
prefix "TTLTEST "
This is in the log file:
Aug 16 15:08:58 name kernel: TTLTEST IN= OUT=eno2 SRC=217.100.X.X
DST=136.144.X.X LEN=64 TOS=0x10 PREC=0x00 TTL=63 ID=32700 DF PROTO=64
So this seems like a bug to me.
Altering other IP/TCP fields like dport or sport as documented on the following
link works fine:
<a href="https://wiki.nftables.org/wiki-nftables/index.php/Mangle_packet_header_fields">https://wiki.nftables.org/wiki-nftables/index.php/Mangle_packet_header_fields</a>
Thanks in advance.</pre>
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</p>
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