house ppp # iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
REJECT     udp  --  anywhere             anywhere            udp dpt:bootps reject-with icmp-port-unreachable
REJECT     udp  --  anywhere             anywhere            udp dpt:domain reject-with icmp-port-unreachable
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ssh
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ssh
DROP       tcp  --  anywhere             anywhere            tcp dpts:0:1023
DROP       udp  --  anywhere             anywhere            udp dpts:0:1023

Chain FORWARD (policy DROP)
target     prot opt source               destination
DROP       all  --  anywhere             10.1.2.0/24
ACCEPT     all  --  10.1.2.0/24          anywhere
ACCEPT     all  --  anywhere             10.1.2.0/24
ACCEPT     all  --  anywhere             10.1.2.0/24

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain keep_state (0 references)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED
RETURN     all  --  anywhere             anywhere