Firewall Wizards mailing list archives
Re: PIX -> ISA -> OWA Configuration
From: Jason Gomes <greyline () phreaker net>
Date: Tue, 03 May 2005 22:01:59 -1000
I totally agree with your assessment, however, my question is to determine the best theoretical placement for the back-end firewall no matter what type of firewall is used. If you had limited resources and were limited to using the devices outlined below, what would be your preferred network topology?
Kevin wrote:
-----Original Message----- What is the preferred placement for a OWA front-end server given these two possible network configurations and why? 1) [Internet] <==> [PIX Firewall] <==> [ISA Proxy] <==> [PIX Firewall] <==> [OWA] <==> [Internal Net w/Exchange Svr] 2) [Internet] <==> [PIX Firewall] <==> [ISA Proxy] <==> [OWA] <==> [PIX Firewall] <==> [Internal Net w/Exchange Svr]None of the above. Use a second, different firewall to control the Windows-protocol communication between the OWA server and your internal trusted network, like so: 3) [Internet] <==> [PIX Firewall] <==> [ISA Proxy] <==> [OWA with Host-based IPS] <==> [Different Firewall] <==> [Internal Exchange Svr with Host-based IPS] In this scenario, any one element in the path can be vulnerable at any moment in time and the internal resources remain protected. Of course the next question is if you are going to this extreme, why involve the Microsoft ISA proxy at all? Why not just replace the " [PIX Firewall] <==> [ISA Proxy] <==>" part of the chain with a more complex firewall capable of handling the combined tasks of SSL acceleration and URL filtering?
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Current thread:
- RE: PIX -> ISA -> OWA Configuration, (continued)
- RE: PIX -> ISA -> OWA Configuration Ben Nagy (May 03)
- RE: PIX -> ISA -> OWA Configuration Sanford Reed (May 05)
- RE: PIX -> ISA -> OWA Configuration Ben Nagy (May 05)
- RE: PIX -> ISA -> OWA Configuration Sanford Reed (May 05)
- RE: PIX -> ISA -> OWA Configuration Ben Nagy (May 03)
- RE: PIX -> ISA -> OWA Configuration Mark Tinberg (May 05)
- RE: PIX -> ISA -> OWA Configuration Paul Melson (May 03)
- Re: PIX -> ISA -> OWA Configuration Kevin (May 05)
- Re: PIX -> ISA -> OWA Configuration Jason Gomes (May 05)
- RE: PIX -> ISA -> OWA Configuration Frank Knobbe (May 05)
- RE: PIX -> ISA -> OWA Configuration Paul Melson (May 05)
- Re: PIX -> ISA -> OWA Configuration Michael Brown (May 08)
- RE: PIX -> ISA -> OWA Configuration Mark Tinberg (May 08)
- Re: PIX -> ISA -> OWA Configuration Victor Williams (May 08)