root@OpenWrt:~# iptables -L FORWARD -v
Chain FORWARD (policy DROP 3 packets, 156 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DROP       all  --  any    any     anywhere             anywhere            state INVALID
    2    92 TCPMSS     tcp  --  any    any     anywhere             anywhere            tcp flags:SYN,RST/SYN TCPMSS clamp to PMTU
  140  132K ACCEPT     all  --  any    any     anywhere             anywhere            state RELATED,ESTABLISHED
    1    48 forwarding_rule  all  --  any    any     anywhere             anywhere
    0     0 forwarding_wan  all  --  ppp0   any     anywhere             anywhere
    0     0 ACCEPT     all  --  br-lan br-lan  anywhere             anywhere
    1    48 ACCEPT     all  --  br-lan ppp0    anywhere             anywhere
    0     0 ACCEPT     all  --  tun0   any     anywhere             anywhere