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PIX alternate route via VPN?

Posted on 2007-04-09
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Last Modified: 2010-04-09
I have a PIX 515e in front of a network. On the Inside interface is another router that leads to a downstream internal network connected via a point to point T1 line. The downstream network uses the T1 line and PIX to the to the Internet.

For redundancy, we have a second internet connection and a second firewall installed locally on the downstream network.

Because we have remote users VPN’ing into the PIX to get to the downstream network, if the T1 line goes down they no longer have access to company resources.

What I’d like to do is build a VPN from the PIX to the second firewall on the LAN and use that as an alternate route back to the LAN should the T1 go down (which is has several times lately).

First, is that possible, and if so can someone guide me on how to setup the PIX to choose a path on a tunnel vs one located down its inside interface?

Hope this makes sense.
Thanks,
-Will
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Question by:willp2
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Expert Comment

by:lrmoore
ID: 18881607
It might be a better solution for your VPN users to simply configure the other site PIX for VPN and set up the client with alternate IP. If one PIX is not accessible, they will automatically connect to the other one and still have access to everything on both networks through the P2P T1.
For users in Site A to use the Internet connection at Site B in case of Internet failure at A, then you have some other issues. I would suggest using the P2P router as the local gateway, setup SLA monitor on that router and let it change the routes from local PIX to remote router in event the local Internet goes down.
If you want more details on that, let me know.
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Author Comment

by:willp2
ID: 18882503
Configuring the users with a second VPN gateway makes a lot of sense. I didn't think of that because the other firewall is not a PIX. I suppose its possible to get them to connect to that firewall anyway, as long as its setup correctly.

And yes, I'd love to hear more about the SLA monitor. That is definetly the other side of this issue that needs to be addressed.

Thanks!
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Accepted Solution

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lrmoore earned 500 total points
ID: 18882711
Using this example, you can get some ideas of what it does.
Basically, setup a ping to a known host on the internet, make sure the path taken goes through your PIX. If the ping stops, then change the default route to the other router over the P2P link. Works pretty well, actually. You can also use Lan2Lan VPN between the two Internet firewalls as a backup for your P2P T1 the same way.

http://www.cisco.com/en/US/products/sw/iosswrel/ps5413/products_feature_guide09186a00801d862d.html
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