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Using Linux as router (mini-FAQ)

Q: is there an easy way to set the max mtu on the router side instead of setting the mtu on each mashine?
A: add the following line into your /etc/ppp/ip-up script

/sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
this does the job for you.

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