Directing Traffic on 2 LAN Cards

Xing · 08-13-2005, 03:56 AM

My gateway has 2 cards

192.168.1.3 is for my ISP and 172.16.56.201 for my internal LAN

How do i tell my outside traffic to go through 192.168.1.3 and my internal traffic to go through 172.16.56.201

regards

xing

eantoranz · 08-13-2005, 12:07 PM

??? I don't get your question.

Want to use that box as a router?

If that's the case, you don't have to do much. You have to set both network interfaces and add the default route to your ISP.

Enable forwarding and masquerade traffic going to your ISP. Suppose eth1 is the interface to your isp:

Code:

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

That will do... maybe there is this or that other detail.. but that's the very basic setup.

Oh... to your lan hosts, set your router as their default gateway.

Xing · 08-17-2005, 02:59 AM

That is right..

i want to set up a router but i am facing problems with the route command.. i.e to set the routes..

my local lan is 172.16.56.x and i am able to ping the route 172.16.56.129, which connects me to outside world but i am not able to connect beyond 172.16.56.129.

i ran a traceroute for 172.16.1.100 which is beyond 172.16.56.129 and came to know that traceroute is going through eth1 to 192.168.1.1.. now i want that traffic to local Lan should be routed through eth0 (172.16.56.201) and that for ISP should be routed through eth1 (192.168.1.3)