[ltp] Network - 2 ethernet cards instead of a hub

Richard Neill linux-thinkpad@linux-thinkpad.org
Fri, 26 Dec 2003 22:55:13 +0000

Dear All,

Sorry if this appears to be a stupid question. I know it's not precisely 
thinkpad related. I've tried google, but I don't know the correct term 
for what I'm trying to do, so I don't know what to search for. Any 
pointers would be wonderful!

Basically, I have 2 computers, one of which is my new thinkpad and which 
has 2 ethernet cards. We are on a network, and I want to avoid buying an 
extra switch/hub. I want to wire up the computers thus:


instead of


Both the old and new TPad should be visible throughout the network 
(192.168.0.*) and should obtain their IP addresses from a central DHCP 
machine which is also the internet gateway. (I'm assuming eth1 on 
NewTPad must be static)

As far as I can tell, this isn't "internet connection sharing" (I'm not 
trying to do IP masquerading), and it's not "ethernet bridging" because 
I want the bridge machine (NewTPad) to be connected itself via the 
bridge. (i.e.
brctl addbr br0
brctl addif br0 eth0
brctl br0 addif eth1
ins't sufficient because the NewTpad cannot then use eth0 for itself)

Thanks for your help - I'm stumped!

Best wishes, and a happy New Year!


P.S. All the hardware is working for "normal" network use.

rn214@hermes.cam.ac.uk  **  http://www.richardneill.org
Richard Neill, Trinity College, Cambridge, CB21TQ, U.K.