On Thu, Sep 9, 2010 at 12:41 PM, george <theonlydamnedavailablename@gmail.com> wrote:

Afternoon Skunks;

I have a scenario as follows;

1) 2 upstream providers-lets call them ISP_A and ISP_B.
2) LAN IPs-192.168.1.0/24. I would like to route by source IP, e.g. 192.168.1.14 to go out ISP_B, 192.168.1.72 out ISP_A to any network.

Any ideas how i can implement this on a linux gateway?

With something like IPNat (IPFilter), assuming ISP_A is connected on eth0 and ISP_B is connected on eth1:

map eth0 from 192.168.1.72/32 !to 192.168.1.0/24 -> 0/32 portmap tcp/udp auto
map eth0 from 192.168.1.72/32 !to 192.168.1.0/24 -> 0/32

map eth1 from 192.168.1.14/32 !to 192.168.1.0/24 -> 0/32 portmap tcp/udp auto
map eth1 from 192.168.1.14/32 !to 192.168.1.0/24 -> 0/32

... but I don't know if Linux uses IPFilter/IPNat, so you can translate those into IPTables:-)