Firewall Wizards: Re: PIX -> ISA -> OWA Configuration

[Danny <nocmonkey () gmail com>]

On 5/1/05, Jason Gomes <greyline () phreaker net> wrote:
> 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]
>
> Notes:
> The ISA server is performing a reverse proxy for HTTPS connections.
> In #1, the backend firewall will only allow port 443 through to OWA.
> In #2, all ports required for OWA to communicate with the internal
> exchange server is allowed.
What type of clients?  Road warrior employees with laptops? If so, how about:

3) Verified client with proprietary VPN client and AES 256 -> Big bad
Innernat -> Firewall only allowing connections from proprietary VPN
client -> ISA Proxy -> OWA & Exchange

...D
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