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Firewall behind a firewall

jrri
jrri asked
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Last Modified: 2010-04-09
My network looks like this  ISP===RTR====FW++++switches-----LAN
I tried to put another firewall after the first on the same network but it doesn't like the inside and outside interface on the same network, any way around that other than adding another network?
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first of all, I am not sure why you need another firewall, unless you are talking about application firewall (like MS ISA), which you can install on the server.
If you really need another firewall, you will have to add another software. Firewall are usually layer3 (and above) device, which needs to have different networks on it's each interface.

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Commented:
Both are hardware, first is a Fotigate 60 and the second is a Cisco ASA5505.  The second one has some features the first doesn't and I didn't have time to convert the config of the first to the second.  I'm a lone IT guy in a small business so I'm OK at everything but for time sake didn't want to fumble through the conversion.  Also didn't want to rush it and leave some monster holes open or other bad things.
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Commented:
I kinda thought I'd either have to add another network which isn't all bad or replace the existing device but I figured I'd ask
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