[root@gw sysconfig]# cat iptables
# Generated by iptables-save v1.4.7 on Fri Sep  9 22:19:19 2011
*nat
:OUTPUT ACCEPT [0:0]
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -o eth1 -j MASQUERADE
COMMIT
# Completed on Fri Sep  9 22:19:19 2011
# Generated by iptables-save v1.4.7 on Fri Sep  9 22:19:19 2011
*mangle
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT
# Completed on Fri Sep  9 22:19:19 2011
# Generated by iptables-save v1.4.7 on Fri Sep  9 22:19:19 2011
*filter
:FORWARD ACCEPT [0:0]
:INPUT DROP [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -i eth0 -j ACCEPT
#-A INPUT -p icmp -i eth1 -j ACCEPT
#-A INPUT -p tcp -m tcp -i eth1 --dport 25 -j ACCEPT
COMMIT
# Completed on Fri Sep  9 22:19:19 2011