iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X


iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT


iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
iptables -t nat -P OUTPUT ACCEPT


iptables --append FORWARD --in-interface ath0 -j ACCEPT
iptables --append FORWARD --in-interface eth0 -j ACCEPT
iptables --table nat --append POSTROUTING --out-interface ppp0 -j MASQUERADE
iptables --table nat --append POSTROUTING --out-interface ath0 -j MASQUERADE