I have a server running ubuntu 10.04 with four interfaces.
eth1 have static WAN ip's, and
eth3 are connected to two separate NAT networks
eth0 is masqueraded and NAT traffic from
eth2 is forwarded to it. In order to forward
eth3 traffic to
eth1 I have used these rules:
ip route add xxx.xxx.xxx.176/29 dev eth1 src xxx.xxx.xxx.180 table link2 ip route add default via xxx.xxx.xxx.178 dev eth1 table link2 ip route add xxx.xxx.xxx.176/29 dev eth1 src xxx.xxx.xxx.180 ip rule add from xxx.xxx.xxx.180/32 table link2 ip rule add iif eth3 lookup link2 ip route add 192.168.1.0/24 dev eth3 table link2
This setup is working fine.
eth1 is masqueraded and NAT traffic from
eth3 is forwarded to it. But I feel some rules above are redundant, and there must be a simpler way of achieving it. Are there any better ways of doing it?