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Linux - Networking This forum is for any issue related to networks or networking.
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Old 06-05-2008, 11:32 AM   #1
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Registered: Jun 2008
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Ubuntu Second Internal Network

Here is my setup

1 Windows Machine

4 Ubuntu 7.10 Machines

I want to have two separate networks, 1 100/Mbps network going thru my wireless router (, which works fine), and one gigabit network going thru my gigabit switch for file transfers. Ubuntu machines are using eth0 for 100/Mpbs network and eth1 for gigabit. I believe I have the routing setup properly.

# ip route show dev eth0  proto kernel  scope link  src dev eth1  proto kernel  scope link  src dev eth0  scope link  metric 1000 

default via dev eth0 

default via dev eth1  scope link  metric 100 

default via dev eth0  metric 100
This is where I am having the problem, I guess I need to route my gigabit traffice thru a computer on the gigabit network, which I chose to be What needs to be installed and setup on this machine to get this to work, I need to route traffic between my machines to use eth1, all machines use a static ip don't know if that would help. I chose to do it this way because I was having trouble getting gigabit speeds having the switch connected to my router and need my laptop to also be able to connect to all machines.

Here is some more information.

Eth0 will connect all machines to the Internet thru a wireless router and allow communication with a XP laptop. Eth1 will be gigabit, won't be connected to the Internet (or router) and will be used for internal traffic. I guess all I need is to be able to route to certain machines using eth1 and and get Internet and route to laptop with eth0.

This is a link to what I posted on the Ubuntu forum, it contains an attachment hopefully showing what I am trying to accomplish.

Old 06-06-2008, 08:11 AM   #2
Registered: Jul 2007
Distribution: Ubuntu
Posts: 99

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Generally speaking you will need to make sure that ip forwarding is enabled on For this, use the following command.

echo 1 > /proc/sys/net/ipv4/ip_forward
So eth1 on that box is going to be connected to the gig switch correct? The routing looks to be correct, but make sure its correct on each of the machines for eth1 to route traffic correctly. Also you will need to set a default route on the machine.


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