Simple Linux NAT router

[root@fedora ~]# iptables-save
# Generated by iptables-save v1.4.14 on Thu Sep 26 18:01:41 2013
*nat
:PREROUTING ACCEPT [12:2850]
:INPUT ACCEPT [2:120]
:OUTPUT ACCEPT [22:1580]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -o p2p1 -j MASQUERADE
COMMIT
# Completed on Thu Sep 26 18:01:41 2013
# Generated by iptables-save v1.4.14 on Thu Sep 26 18:01:41 2013
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [83:10698]
-A INPUT -i p7p1 -j ACCEPT
-A INPUT -i p8p1 -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -p icmp -j ACCEPT
-A FORWARD -i lo -j ACCEPT
-A FORWARD -i p7p1 -o p2p1 -j ACCEPT
-A FORWARD -i p8p1 -o p2p1 -j ACCEPT
-A FORWARD -i p7p1 -o p8p1 -j ACCEPT
-A FORWARD -i p8p1 -o p7p1 -j ACCEPT
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Thu Sep 26 18:01:41 2013