Re: [LARTC] two providers.

[<goblin@pentex.pl>]

> So, there's a trouble.
> 
> I have debian etch linux. 2.6.18-4 kernel.
> 
> On this computer i have three interfaces: eth0 - my lan, eth1, eth2 -
> providers.
> 
> By default all internet traffic routed through eth2. But i NEED to
> route mail and icq (tcp110, tcp25, tcp5190) through eth1. How can i do
> that?

A while ago ive used a similar configuration, what ive done was:

- create additionall routing table

add all regular entries to it with changed default gateway for the second provider like:

ip route add xxx.xxx.xxx.xxx via yyy.yyy.yyy.yyy table 2
...
ip route add default via IP_OF_2ND_GATEWAY table 2

- mark desired traffic with iptables

iptables -I FORWARD -s LAN_NET/MASK -p tcp --dport XXX -j MARK --set-mark 2

- use ip rules to direct marked packets via alternative routing table

ip rule add fwmark 2 table 2

- and maby add additionall rule to make all packages originating at eth1 ip to go via table 2

ip rule add from ETH1_IP table 2

should be more or less something like this, though i dont recall if syntax was exactly like ive wrote above.
big dissadvantage of this solution is utilisation of marks, that might be used for another purpose.

-- 
Radek 'Goblin' Pieczonka

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