2 NIC's on the same network and ISA server

[Netmasker]

I want to run ISA server on my Windows 2000 Server. In order to use the ISA
Server Firewall and not only the ISA Proxy, two network adapters are
required (and I installed them).
The problem is (if there is one) that my Server is not connected directly to
the internet but it uses a Router with an IP address like: 10.1.1.1 and the
Router will be the one that will provide internet access (using NAT).
My LAN, including my Server and Router connect to a hub on the same network:
10.1.1.0/24 and this is the only network that the router will give internet
access!!

So I am thinking of setting up the two network adapters on the Server with
IP addresses of the same network, e.g.
Internal interface IP: 10.1.1.2
External interface IP: 10.1.1.3 (with NetBios disabled and the gateway to be
10.1.1.1).

What problems this configuration will cause
a) on Server networking functionality ?
b) on ISA Server functionality ??

Can anyone propose any other solution in order to use ISA server Firewall
features ???
(p.s. Router configuration can not be changed)

Thanks in advance

 

[Marina Roos]

You will have to put your internal nic on a different IP-range than your
external nic.
So something like IP 192.168.0.2, gateway blanc, DNS 192.168.0.2
External nic10.1.1.3, gateway 10.1.1.1 (your router-IP), DNS 192.168.0.2
Check bindingorder and make sure that internal nic is on top.
In your DNS-server you put the ISP-DNS-numbers in the tab Forwarders.
In ISA you make sure that the external IP-range is NOT in the LAT.

Marina