Hello. I have an ISA 2004 Standard, acting as a firewall, 3 Networks --> Internal, Perimeter and External. I have 6 IP Address on the external interface. On of them of course is primary. I'm an old checkpoint fan so I come from their world. As I started working with ISA i noticed some issues that must be solved. One of them, and very urgent for me, is the fact that I can't configure a static nat to an internal host. Example: I have an internal host who uses an internet application (From an ASP). For security reasons, this host must reach the web server which hosts the application he uses with a certain Ip address, one of the external interface's addresses. This specific address is not the primary address of the interface and I can't make it primary because of other issues. All I wish to do, is configure a static nat for that specific user, in order for him to access the web application with a different IP than the primary one on the external Interface of the ISA. This is a very simple procedure on a checkpoint firewall. Here, I just can't find the way.... I will appreciate any suggestions.
Bad news. You can't solve this problem. We've been asking for this feature for years and years and years. Maybe some day, if we close our eyes really, really tight and wish harder than we ever wished before, it will happen.
From: Marquette, MI
Sounds like a problem I had with trying to get a video conferencing unit working with ISA2000. I ended up having to publish that unit as a server to get it to work. It's not so much that you "can't" do things with ISA, but that they are done differently, which takes some getting used to.
I'm assuming you mean a client on an internal network trying to access a webserver on an external network, using a specific IP address which is bound to the external NIC on the ISA server. In that case, I would try a static route using the server's ROUTE ADD function to direct it through a certain IP. Not sure if this will work, but it's worth a shot.
I just realized that a lot of people are using the term "one-to-one NAT" or "Static NAT" to refer to the functionality that we added to ISA with our IP Binder filter (i.e. binding of outbound traffic to a specific external interface). Until now I didn't realize there were so many names for this. So I'm going through a few of these ancient and unanswered forum threads and adding a link to IP Binder so future searchers can see there's a solution.