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# Allow established and related connections
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
# Forward from and to the LAN
iptables -A FORWARD -i $LAN_IFACE -o $EXT_IFACE -p tcp \
-s $LAN_ADDRESSES --sport $UNPRIVPORTS --dport 22 \
-m state --state NEW -j ACCEPT
This is the routing table:
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
0.0.0.0 192.168.2.1 0.0.0.0 UG 0 0 0 eth1
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
That should be enough, I think, to forward from private lan to EXT. Do I need MASQ or what else?