ISA Server & a WiFi Hotspot (some DHCP for good measure too)



Running an SBS2K3STD installation on a dell server that acts as a web server, exchange server, dns server, dhcp server and, of course isa server (2k4). I run the server with no monitor/keyboard/mouse in the back office. To complicate things, I have a router on which I have disabled DHCP and have nothing plugged into the wan port (the dsl goes into one nic on the server and the other nic is plugged into port 4 of the router). Essentially this "router" is being used exclusively as a switch and a wireless access point.

I'm new to ISA, so this may be an easy question. I have an internal network (192.168.0.0/24) with 5 client computers. The server is at 192.168.0.1 and the above "router/switch" is at 192.168.0.253. In the DHCP console I have excluded 192.168.0.1 to 192.168.0.9 from the address pool, as well as 192.168.0.14 to 192.168.0.99 and 192.168.0.200 to 192.168.0.254. Then, also under the DHCP, I have set up a reservation for the mac address of each of my 5 client computers for IP addresses 192.168.0.10 to 192.168.0.14. This leaves 192.168.0.100 to 192.168.0.199 for any future clients.

The reason that I have done this is because I wanted to set up ISA with a network named "Internal" that included my client computers (192.168.0.10 to 192.168.0.14) with unfetterd access to the internal network and to the internet, and a second network named "Hotspot" (or whatever) for 192.168.0.100 to 192.168.0.199 with access only to the internet. My intention was to then have ISA redirect client computers in the hotspot network to a web site of my creation that would have users register before being allowed to proceed to the intended web site.

Obviously my thinking was flawed somewhere along the line because when I created the two networks in ISA and clicked on "Apply," my TSE session to the server was broken and I could not reconnect. My access to the internet was also cut off. As I could not attach a monitor to the server from where it was, I had no choice but to shut off the server forcefully (sob). Then I moved it to a location with a monitor and reverted my ISA networks back to the original setting and everything worked happily.

Whew! I guess my question are: Why did ISA cut me off from my server when I created the two networks? Can ISA segregate my internal network of 5 computers from a wireless hotspot network so that the hotspot network can't see the internal network? Is it best to just get another nic and WiFi access point (and assign it a network of 192.168.1.0/24)? Can ISA redirect users on the hotspot network to my web site to register them, then let them proceed to whatever web site they requested and let them have internet access for a period of time (however long they've paid for), after which they would have to be redirected to the registration site again?

Hope that's not too tough.


f .



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