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Back To Back Firewall

Posted on 2004-08-30
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Last Modified: 2013-11-16
I've been requested to implement a back to back firewall using a current hardware solution we have in place and windows ISA server . . . I was just wondering if i could receive any suggestions on which should be placed on the outside (Internet) and which should be on the inside.

We also use a VPN, would this require two seperate VPN licenses:  one for the current solution and one for the ISA server?

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Question by:mynamebecory2
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syn_ack_fin earned 125 total points
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"which should be on the inside."
I'd recommend the hardware appliance on the outside and the ISA on the inside for these reasons:
1) The ISA is Windows based. Having a hardware appliance in front helps protect it since the hardware device will probably have a very hardened OS.
2) The ISA server would need to attach to your domain for transparent authentication if used. Nice feature, but not a good idea for a front firewall.
3) The ISA is probably going to be used as a caching server, thus having it on the inside prevents having an extra hop.

"We also use a VPN, would this require two seperate VPN licenses:"
No. You would only need a license for the device where you terminate the VPN. If you terminate the VPN to the ISA then all you would need to do is create a pass-through from the front device.

Good Luck
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