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I am trying to replicate the following Linux iptables rule on my FreeBSD installation, but I cannot find much documentation of either pf or ipf's TCP MSS settings.

/sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu

How do I translate the rule above into pf or ipf rule?

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up vote 0 down vote accepted

After some investigation, the following pf feature seems to help:


However, I did not go ahead to use freebsd and thus have not figured out the correct pf rule translation.

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