$ iptables -t mangle -nvL Chain OUTPUT (policy ACCEPT 15946 packets, 7814K bytes) pkts bytes target prot opt in out source destination 192 35671 MARK tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp spt:22 MARK set 0xa 31 4173 MARK tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 MARK set 0xa