On Wednesday 16 January 2002 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.
Say we have routers for ISPX and ISPY with IP addresses X and Y.
We source NAT incoming packets to either X or Y. Then return packets
have destination X or Y. What happens when those packets hit the
firewall?
Scenario A (good)
----------
* Packets forwarded to correct interface because of destination
address X or Y.
* Source NAT changes X or Y to the original source (and now destination)
address.
Scenario B (bad)
----------
* Source NAT changes X or Y to the original source (and now destination)
address.
* Packets forwarded to the incorrect interface because of default root.
In other words, what is the relative order of choosing the interface and
undoing the source NAT?
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