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Router between ISA server and Firewall Clients

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Router between ISA server and Firewall Clients - 25.May2005 7:43:00 PM   


Posts: 6
Joined: 13.May2005
Status: offline
I have just a seemingly simple question. But, have not been able to find an answer. If you have an ISA 2K4 server configured with the external interface being a public addr and internal interface is Then there is a router between the ISA server and the internal network clients. The external interface of the router is and the internal interface of the router is All the clients on the internal network are in the same subnet of 192.168.1.XXX/24. The workstation clients have the router as the default gateway. I was wondering if the firewall client will work correctly even though there is a router in the middle.

I have been trying to get this to work and have not been successful as of yet. I am not sure of the reason, as I had thought that the firewall client was strictly TCP/IP. I have used the fwctool and it can ping the ISA server correctly. I can ping and resolve public FQDN's. But I enable the firewall client and the browser does not work. If I use the secureNAT setup on a client workstation the topology works fine.

I would really appreciate some advise as I am not coming up with too many more possible options. I am not sure I like the router being in the middle as I feel I will loseing some control with the ISA server's internal network just consist of the router's external interface. Any advice would be greatly appreciated.

Thank you.
Post #: 1
RE: Router between ISA server and Firewall Clients - 26.May2005 3:38:00 PM   


Posts: 506
Joined: 24.Apr.2003
Status: offline
Microsoft's official line is that there should be no hops between clients and ISA. Doubt if you'll find this documented. I got it from MS engineer. However, really their main concern is firewalls inbetween, and they do accept that routers will inevitably lie between.

Are your browsers setup as web proxy client? (i.e. using a auto config script)? If not, would recommend you try that. Type in the autoconfig settings of IE:


See if that works.

(in reply to mpkn3rd)
Post #: 2

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