Win2K Server based VPN

I've been with this company for exactly 2 weeks now, so I'm not completely up to speed on how the network is configured due to a lack of updated documentation.

Here's the scenario:  We are planning on switching to AT&T as a data provider.  AT&T has installed the new T1 connected to a Cisco 2600 router that is fully managed by AT&T.  Since the company is small, I decided to setup a Win2K Server based VPN.  Currently, the server is configured and connected to the LAN interface on the router and to our LAN through the other NIC on the server.  I can connect to the server remotely from inside the LAN and verify that we can get to the Internet from the NIC that is connected to our LAN.  However, I cannot establish a VPN connection or connect to the other interface that has been configured with one of the public IPs given to us by AT&T.  I think the issue might be the configuration on the router, but I figured I would try this support method before I put in a call to AT&T.  

As always, any help will be greatly appricated.

 
omneonbellAsked:
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svenkarlsenCommented:
Hi omneonbell,

Probably the router configuration, - you need to have AT&T configure static NAT routes on the router to your server for all the ports you will be using:

A router and firewall must be able to pass TCP port 1723 (Point-to-Point Tunneling Protocol [PPTP]) and Generic Route Encapsulation (GRE) protocol 47 for PPTP traffic to connect correctly. When a cable/DSL router cannot map GRE protocol 47 to the Routing and Remote Access server, you cannot connect to the server from the Internet.

 
Here's a good link for you:
http://support.microsoft.com/default.aspx?scid=kb;en-us;321516

Kind regards,
Sven
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