Re: NT sub-ISP setup - reformulating

Donald E. Swett ( (no email) )
Mon, 8 Dec 1997 23:14:27 -0500

There are two scenarios, on with a proxy and one without.

With proxy ---- Two separate subnets are required, one behind the proxy and
one in front of it. All machines behind the proxy should have a gateway
equal to the IP address of the NIC card on the server that is attached to
the internal net. The dialins and the NT will still use the router IP for a
gateway. Address behind the proxy can be whatever you want and does not
have to be a legitimate class c. We normally use

Without proxy ---- A single subnet is possible. As far as the gateway, it
should be your router for the dialins and the NT server and everything else.
In this case, all IP's need to be legitimate.

-----Original Message-----
From: Clara Hatem <>
To: <>
Cc: <>
Date: Monday, December 08, 1997 4:15 PM
Subject: NT sub-ISP setup - reformulating

>Hello everyone,
>And thanks for your previous answers. Mitch, my question was not how to
>configure the cisco router (this is something I can manage to do, and
>have done quite often. serial IP on my subnet, ethernet IP on his ,
>default route to my router serial port IP, and that's it !)
>but then may be I didn't make myself clear. So,
>my question actually is:
>1- How to configure the NT server (and the clients dialing in to it), in
>order to have all the incoming connections on NT server com ports,
>routed to the server ethernet (and from there to the cisco 1005 router
>which provides the Internet connection to our services) ?? I have
>planned to enable IP forwarding, and specify the router ethernet address
>as TCP/IP gateway for the NT server. Is this the proper way to do it ?
>2- Do I have to assign IPs for the LAN (PCs, NT ethernet, router
>ethernet) in another subnet than the subnet used by the RRAS server
>(pool)?? . I believe I read a previous thread on this list , where you
>were discussing if NT would route between addresses from the same
>subnet. But I never new the answer .......
>I mean can the address assigned to the NT NIC be in the same subnet as
>the RRAS pool ???? Or do I have to assign two different subnets (one
>for LAN NICs including server and cisco router ethernets, the other for
>RRAS pool) ???? Donald: your answer, talking about a class C (or at
>least a 32 IP addresses subnet), gave me the impression that a single
>subnet is possible.
>and in both cases (same subnet, or different ones), what IP should be
>stated as the TCP/IP gateway on the client stations dialing in to NT RAS
>I hope my questions are clearer this time.
>Thanks everyone for your help,
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