[clug] A Routing problem

[Martijn van Oosterhout]

You may be able to do this using rules. Maybe something like:

ip rule add dev eth2 to 123.123.123.0/24 table 500 pref 500
ip rule add dev eth0 to 123.123.123.0/24 table 501 pref 501

ip route add 123.123.123.0/24 dev eth2 table 500
ip route add 123.123.123.0/24 dev eth0 table 501

Be aware this is asymmetric routing and you'll get all the issues
related to that. I'm not totally sure about the syntax, nor whether the
"dev" argument represents the incoming interface, but it should point
you in the right direction.

Hope this helps,

On Wed, Oct 20, 2004 at 07:38:52PM +1000, Stephen Hodgman wrote:
> I have a question regarding routing.  I have a linux system with three 
> interfaces say eth0, eth1 & eth2
> 
> On eth0 is network 123.123.123.0/24 (say)
> I want traffic entering eth1, destined for 123.123.123.0/24 to be routed 
> to eth0 - always
> I want traffic entering from eth2 destined for 123.123.123.0/24 to be 
> routed to eth2 - always
> The reason is that there is a route either way but I only want one 
> device to route directly.
> 
> Can this be done?  It seems to require routing tables based on source 
> address/interface.
> I would appreciate knowing how this can be done.
> TIA.
> 
> -- 
> Steve Hodgman
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-- 
Martijn van Oosterhout   <kleptog at svana.org>   http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.
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