LAN to LAN Router
 

Hi Guys,

I'm trying to setup a router to route traffic between two lan segments. Here is my setup below:

existing 10.0.0.0 network
Wireless bridge 10.0.0.5
eth0 10.0.0.21 255.255.255.0

box debian 3.1

eth1 192.168.0.1 255.255.255.0
switch

I have set the gateway on eth0 as my existing 10.0.0.20 router and can ping the gateway from the box via eth0 via the wireless bridge.

I've enabled ip forwarding. When I try to ping 10.0.0.20 from 192.168.0.2laptop which is connected via the switch to eth1 I cannot get any traffic to the 10.0.0.0 network where the 10.0.0.20 router is sat.

I have spent hours googling but am not able to get it working. The only way I can is to setup a smoothwall box between the 192.168.0.0 and 10.0.0.0 network and am able to ping from the 192.168.0.0 network.

If advice and help would be apprieciated.

Daniel

What are your current firewall settings on the box? You have forwarding enabled, but it might be default DROP.

Hi camh,

Iptables is not imstalled and there are no rules.

Daniel

The issue is probably within the routing table. Your 192.168.0.2 laptop doesn't know a way to get to your 10.x network. You might need to add a route to your laptop specifying how to get to the 10.x network.
Eg. route add -net 10.0.0.0/24 netmask 255.255.255.0 gw 192.168.0.1
or try possibly specifying 192.168.0.1 as the default gw on your laptop.

However, without a firewall on the debian box you have nothing protecting your 10.0.0.0 network from the 192.168 network and visa-versa (not a big deal if it's a home network.. but if it's a company, this would be an issue.)

Hope this helps.

Hi,

Thanks for your reply. It is a local home network so a firewall is not needed. I've spent some time since my last post trying to get this to work. Basically I just need to route traffic between the two networks and be able to access the machines via each address range.

On the router box I added three routes telling it which interfaces the ip ranges are on and then a default route sat on the 10.0 network.

I have ip_forward set to 1 so thats on. I tried setting up iptables with masquerading and that seems to work however access from 10.0 to 192.168 is not possible.

Daniel