tcpmss match for IPv6 ?

Patrick McHardy kaber at
Fri Jul 13 15:13:23 CEST 2007

Pascal Hambourg wrote:
> Hello,
> I hope this is the right list for my question.
> Support of the TCPMSS target for IPv6 was recently added in the kernel
> and ip6tables. It can help fixing some MTU blackhole issues, so thanks.
> However there is currently no support of the tcpmss match for IPv6 yet,
> although xt_tcpmss.c in the kernel seems to be IPv6 compatible.
> Has anyone already submitted a patch to add support for an IPv6 tcpmss
> match in ip6tables ? It seems trivial to derive from the existing IPv4
> tcpmss match for iptables. I believe I could even do it although I am
> not a software developper and don't know how to submit a patch.

The latest iptables release should contain an IPv6 capable TCPMSS target.

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