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-   -   LAN to LAN Router (

corerouter0 05-31-2007 07:42 PM

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 network
Wireless bridge

box debian 3.1


I have set the gateway on eth0 as my existing 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 from which is connected via the switch to eth1 I cannot get any traffic to the network where the 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 and network and am able to ping from the network.

If advice and help would be apprieciated.


camh 05-31-2007 09:41 PM

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

corerouter0 06-01-2007 05:20 AM

Hi camh,

Iptables is not imstalled and there are no rules.


camh 06-01-2007 05:49 PM

The issue is probably within the routing table. Your 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 netmask gw
or try possibly specifying as the default gw on your laptop.

However, without a firewall on the debian box you have nothing protecting your 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.

corerouter0 06-02-2007 05:06 AM


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.


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