[LARTC] How to make "external loopback" with 2 interfaces

[LARTC] How to make "external loopback" with 2 interfaces

[David Müller]

Hello

For testing purposes, i would like to make a connection between 2 
network interfaces on the same machine.

For example, i have eth0 (10.0.0.100) and eth1 (10.0.0.101) and would 
like to have the traffic going on the "wire", not just taking the 
"shortcut" inside the protocol stack.

I have played around a little bit with the routing table, but did not 
succeed.

Does Linux and/or the associated network tools support such strange 
requirements and if yes how to i setup the routing table?

TIA

Dave

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Re: [LARTC] How to make "external loopback" with 2 interfaces

[Amit Kucheria]

You would have to hack the IP layer for that AFAIK.

I need the same thing for a device driver I am writing and the only way to 
do this seem to be bypassing the IP layer optimization which basically 
says "If the destination IP is one of my interfaces, pick up pkt from xmit 
queue and put it in recv queue"

ciao,
Amit

On Wed, 5 Jun 2002, David Müller wrote:

> Hello
> 
> For testing purposes, i would like to make a connection between 2 
> network interfaces on the same machine.
> 
> For example, i have eth0 (10.0.0.100) and eth1 (10.0.0.101) and would 
> like to have the traffic going on the "wire", not just taking the 
> "shortcut" inside the protocol stack.
> 
> I have played around a little bit with the routing table, but did not 
> succeed.
> 
> Does Linux and/or the associated network tools support such strange 
> requirements and if yes how to i setup the routing table?
> 
> TIA
> 
> Dave
> 
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
> 

-- 
I'm an angel!!! Honest!
The horns are just there to hold the halo up straight.
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                  Amit Kucheria
          EECS Grad. Research Assistant
         University of Kansas @ Lawrence
   (R): +1-785-830-8521 ||| (C): +1-785-760-2871
____________________________________________________

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