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| :FORWARD,OUTPUT,POSTROUTING
| *mangle
| -j TCPMSS;;FAIL
| -p tcp -j TCPMSS --set-mss 42;;FAIL
| -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j TCPMSS --set-mss 42;=;OK
| -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j TCPMSS --clamp-mss-to-pmtu;=;OK
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