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Setting Max Segment Size (MSS) via iptables
# Add rules
$ sudo iptables -I OUTPUT -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 48
# delete rules
$ sudo iptables -D OUTPUT -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 48
# Add rules
$ sudo iptables -I OUTPUT -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 48
# delete rules
$ sudo iptables -D OUTPUT -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 48