Hi Petr, I don't think it is related to patch 31122, this seems to happen whether you are using that patch or not. Both ip4-icmp-echo-request and ip6-icmp-echo-request set outbound echo replies to have a TTL/hop-limit of 64. The IPv4 node sets the VNET_BUFFER_F_LOCALLY_ORIGINATED flag on the packets it sends but the IPv6 node neglects to do this. Setting that flag will prevent a rewrite node from decrementing the TTL/hop-limit later on.
Here's a patch which sets the flag for outbound IPv6 echo replies - https://gerrit.fd.io/r/c/vpp/+/34040. Can you please test it and report whether it solves the problem? Thanks, -Matt On Mon, Oct 11, 2021 at 1:03 PM Petr Boltík <petr.bol...@gmail.com> wrote: > Hi, > I have found an issue with with linux-cp patch 31122. > [192.168.15.1/24 host1]=>ether=>[host2-Vpp+LinuxCP 192.168.15.2/24] > ipv4 icmp TTL > host2=>host1 TTL64 > host1=>host2 TTL64 > > ipv6 icmp TTL: > host2=>host1 TTL64 > host1 =>host2 TTL63 (there should be the same increasing TTL mechanism as > in the ipv4) > > Thanks for report this message to the right hands. > Regards Petr > > > >
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