[LARTC] 2 Gateways

["Mihai Vlad" <mihaivlad@web-profile.net>]

Hello again,

I may have a common problem to solve but it seems it is harder than I
thought...

I have 2 internet providers (each one having a different gateway).
Behind the router there are around 100 clients that are SNAT-ed.

I want some clients to be SNAT-ed to the first provider, while the others to
the second one.
The following lines should work:

iptables -t nat -A POSTROUTING -s 172.17.31.81  -j SNAT --to-source
$INET_IP_1
iptables -t nat -A POSTROUTING -s 172.17.31.82  -j SNAT --to-source
$INET_IP_2

But... there is a problem... I have to make the packet (after it has been
SNAT-ed)
follow the gateway corresponding to the $INET_IP_1 or to the $INET_IP_2
respectively.

In my routing table I have only one default route... corresponding to one of
the gateways.
Is it possible to have 2 default routes? Is there a more elegant way to
solve this problem?

Is there a way to tell the routing table that every request that has the
source address $INET_IP_1
follow the $GW_1, and every request that has the source address $INET_IP_2
follow the $GW_2?

Thanks in advance,
Mihai Vlad





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