iptables -t nat --list
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination
MASQUERADE  all  --  10.8.0.0/24          anywhere
MASQUERADE  all  --  192.168.0.0/24     anywhere
MASQUERADE  all  --  192.168.0.0/24     anywhere