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PIX: one server with two public IPs on two ISPs


we are on the way to change our ISP.

Because of DNS TTLs it would be nice if we could have our servers mapped to both ISPs at the same time (each server has an IP of ISP1's range and another of ISP2's range).

I have connected ISP1 to one IF of the PIX 515 and ISP2 to an other IF. We use NAT on both interfaces.

We have a router for each of the ISPs.

I set a static route (0/0) to the LAN interface of ISP1's router.

I made a static mapping from internal private IP to the public IP of ISP1 and an other mapping from the internal IP to the public IP of ISP2.

Traffic coming over ISP1 works fine. Traffic coming over ISP2 will not be routed back to ISP2.

So, I understand that the problem is the default route. PIX allows only one.

Is there a way to solve this problem?

Or how can I tell PIX to send traffic back on the same interface it was received?


Re: PIX: one server with two public IPs on two ISPs

You could try configuring logical interfaces and susequently making two default routes possible. Here is the guide with examples:

HTH pls rate!

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