[ale] Routing out to multiple NIC's

[Stephan Uphoff]

Take a look at policy based routing.

http://www.compendium.com.ar/policy-routing.txt


> I'm spinning my gears on this. Gateway machine has 3 connected NIC's. eth0 is
> local LAN only, eth1 is static IP Internet, eth2 is high-speed DHCP Internet.
> Goal: Allow incomming packets on eth1 only (easy) and return packets out on
> eth1 only (not working, all outbound packets dropped)
> Not allow incomming packets on eth2 (easy) and force all eth0 traffic out eth2
> (works OK if default route eth2)
> All traffic originating from local host must go out eth2 (problem, only works
> with defaut route eth2).
> 
> It looks like a routing problem. I can see ICMP packets arriving in on eth1
> (log files getting crowded) then they go through the OUTPUT table and get dropped.
> Somewhere the routing is trying to send them out the default route of eth2 with
> eth1 addressing (I think). If I delete eth2 default route, no traffic uses eth2
> (But my mail works ;)
> 
> I've been reading HOW-TO's and books 'till I'm nearly blind. It seems like
> iptables should be able to handle this OK if the routing were not so dependent on
> default gateways.
> 
> Suggestions, pointers, assistance are elcome and encouraged. Comments
> concerning my low sanity are redundant.
> 
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