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What does this iptables rule mean: tcp flags:0x06/0x02 TCPMSS clamp to PMTU
?
Doing iptables -vnL
on my DD-WRT router shows the following rule in the FORWARD
chain: TCPMSS tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:0x06/0x02 TCPMSS clamp to PMTU
.
Instead of the common actions of ACCEPT
or DROP
it is TCPMSS
. What does this mean?