Single-NIC configuration
From: David King (davidking_at_devnull.spamcop.net)
Date: 03/15/05
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Date: Tue, 15 Mar 2005 11:06:44 -0800
Hi, there, I seem to have some basic misunderstandings about ISA's
purpose, functionality, name, rank, and serial number, so please correct me
if I'm wrong.
We have a SonicWall firewall appliance that accepts our internet
connection, performs NAT routing for the internal machines, and performs
one-to-one NAT for six external IP addresses. He's a busy guy.
Since we will eventually need to perform more than six services, we'd
like to start forwarding ports instead of using one-to-one NAT for those
services. Doing this using the SonicWall is fine, but I'd like to leverage
ISA server, since it gives some finer controls over that.
So basically I'd like to place a machine (the ISA server) in the DMZ of
the SonicWall, and assign that DMZ an outside IP address. Then it would pick
up requests for, say, port 143, and pass that off to the internal network.
If I'm not mistaken, ISA calls this "Server Publishing," and only supports
this in a multiple-NIC environment, where it is actually performing the
routing instead of the SonicWall. Am I wrong?
A caching proxy server would also be nice, and according to the
literature I've seen, is the only supported purpose for a single-NIC'd ISA
server. Is this accurate?
Would it be possible to go ahead and give the ISA server two NICs,
attach them to the same switch, and place that switch in the DMZ of the
SonicWall, and then have it perform routing for these ports? Would this
serve any purpose? Does this offer any immediately visible drawbacks?
Thank you for any input.
-- David King ISA far-from-expert
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