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Is ISA necessary with an exisitng firewall?

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Is ISA necessary with an exisitng firewall? - 23.Apr.2007 3:46:03 PM

a_schnelker

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Joined: 23.Apr.2007
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Is ISA server necessary at the edge if we are already have a Cisco ASA5520 as the firewall, allowing forms-based authentication traffic to OWA inside the firewall? We also utilize Websense for traffic/app filtering.

With Exchange 2007 in the project plan, I'm wondering if it's really necessary to add an additional layer (ISA) to the edge since we already have a firewall? I would like to try to not stack firewalls, and minimize extra administrative work. The boss would like to see both.

Any opinons are appreciated...Thanks

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RE: Is ISA necessary with an exisitng firewall? - 26.Apr.2007 2:21:29 AM

Henrik Walther

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Deploying an ISA server in from of your Exchange environment is not a requirement but typically a good idea primarily in regards to security (clients get pre-authenticated by ISA before they reach your internal network etc.).

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(in reply to a_schnelker)