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Old 11-19-2010, 03:17 PM   #1
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Multible network interfaces, router settings?

Hey guys!

I have a Debian machine up and running with tree network interfaces.
This is what i want it to work with.

eth0 = dhclient from ISP (external)
eth1 = acting as dhcpserver with iptables, for sharing eth0 to "int network A)
eth2 = dhclient to connect to an netgear router that has similar ip adress suffix as eth0 (int network B)

Eth1 is a separat network that has nothing to do with eth0 and eth2, eth2 is simply a gigabit interface to be able to use the machine as a samba server and acces all the files that are on it.

Is it possible to do this? When i have tried i allways get routing problem, I am not able to remotly login to the machine, the only way to conncet to the machine is through eth2.

Both eth0 and eth2 get the same default gateway.

I have tried to search some and found something called multiple ip routing? Am i am the right way or am i total ofcourse?

Thanks in advance POint me in the right direction....
Old 11-21-2010, 05:40 AM   #2
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I think you're missing the point, you should only have *one* default gateway as thats how you get to any networks that aren't directly connected. The default gateway should be configured on eth0, none of the other interfaces need one. For example, you would need to set up a static route to [host_b]'s network if you have something like this:

Old 11-22-2010, 12:53 AM   #3
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Yes, i know that, but how do i force dhclient not to set the default gateway givven from dhcp on eth2? I want to "force" dhclient to use the default gateway given from eth0...
Old 11-22-2010, 08:35 AM   #4
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If you want to ignore the gateway provided by the dhcp server, setting the below in /etc/sysconfig/network-scripts/ifcfg-eth2 would work on a Red Hat based distro:

.. but I'm not sure if there's an equivalent way to do it on Debian, sorry.

<edit> just found this link maybe it will help </edit>

Last edited by kbp; 11-22-2010 at 08:37 AM.


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