$ 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