Chapter 4 of the Adv-Routing-HOWTO seems to maybe cover this.
Or at least it seemed to make some sense to me after much looking at it.
I think you would set up route so that if the source was the IP address
of the external interface then route to that interface.
On Wed, 2002-01-16 at 14:54, Paul Jakma wrote:
> On Wed, 16 Jan 2002, Nick Murtagh wrote:
>> > You need to set up two routing tables, one for each ISP, and then find
> > some way, using netfilter perhaps, to direct packets to the right
> > routing table.
>> if you can find out how to do that, let me know, cause i'm dealing
> with a very similar (nay identical) setup.
>> afaik, at the linux 'internet gateway' you cant do it, cause you need
> to select based on 'gateway chosen', which AFAICT, neither netfilter
> nor the ip utils can do.
>> nat on the routers is the only answer i'm aware of.
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