Re: source route ignored in favor of local interface

On 03/01/2011 11:31 AM, Joe Buehler wrote:

quoted

If you really want to modify things, have you looked at your ip rules?
"ip ru" will dump them.  Typically it looks something like

0:      from all lookup local
32766:  from all lookup main
32767:  from all lookup default

The last item in each row is the name of the routing table.  As you can
see, the first rule is for local interfaces, and a later rule deals with
the main and default routing tables.

You could move the local lookup to rule 1 and add in a new rule 0
specifically dealing with your situation.

We have tried some variations on modifications to ip rules, but the
kernel appears to treat rule 0 specially -- it cannot be deleted, for
example.  This results in the enforcing of local interfaces before
source routes -- surely something that should be a policy decision, not
hard-coded.

Let me rephrase and ask: Does anyone know how to replace the priority 0
rule?

You can do this on more modern kernels (2.6.36 and later definately works..not sure
about earlier).

		ip rule add pref 512 lookup local
		ip rule del pref 0 lookup local

Thanks,
Ben

Joe Buehler
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-- 
Ben Greear [off-list ref]
Candela Technologies Inc  http://www.candelatech.com