NAT over 2 providers (not load balance)

Linux Advanced Routing and Traffic Control

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Hi guys,

Can you take a look at this? :)


		+-----------+
		|           |
	 eth1-|-          |
		|          -|-eth0---LAN---
		|           |
	 eth2-|-          |
		|           |
		+-----------+
-

eth0 is connected to the LAN having the IP=LAN_IP

eth1 is connected to the first  ISP having IP=ISP_IP_1 and GW=ISP_GW_1
eth2 is connected to the second ISP having IP=ISP_IP_2 and GW=ISP_GW_2

I need to selectively SNAT clients in the LAN to ISP_IP_1 or ISP_IP_2.

That would be something like:
$IPTABLES -t nat -A POSTROUTING -s 172.17.31.5 -j SNAT --to-source $ISP_IP_1
$IPTABLES -t nat -A POSTROUTING -s 172.17.31.7 -j SNAT --to-source $ISP_IP_2


This does not work since all the packets are forwarded to the default GW
which is ISP_GW_1.

How can I change this?

As far as I remember, the routing decisions and policy are before the
POSTROUTING chain in which the SNAT occurs...

Please help!

Mihai Vlad  


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