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Help with PPTP Setup

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jturner13

IS-IT--Management
Feb 11, 2002
13
US
I am trying to use PPTP, but something is blocking it. The W2K advanced server (Machine A) is setup on an internal network as 192.168.1.4 and also on the internet through XO. I can connect to A from B (internal LAN address 192.168.1.21), by using the 192.168.1.4. Machine C is a dialup account to the internet. Our Router is managed by XO. They have routed both UDP and TCP for port 1723. I have a cisco 1720 series router. I can connect through Terminal Server from C to A, but I cannot connect the VPN from C to A. I have never setup PPTP before, so perhaps you can tell me where to start looking.
 
Questions:

Has Point To Point Tunneling Protocol been installed?
Has Dialin/dialout access been granted?
To simplfy you hardship.
Your VPN server is connected to a Company Network which connects to the Internet and your having problems connecting from the ISP VPN to your server.

C to A
C= VPN ISP Connection
A= your Server

Ive posted a Link that may help you or confuse you?
Link:
Route once; switch many
 
You are obviously running NAT since you have a private network. Forwarding TCP port 1723 is required. But you also have to forward IP protocol 47. Note that this is NOT TCP/UDP port 47! This cannot be accomplished with standard port forwarding since this is NOT a TCP/UDP port but a GRE packet. Your router must have a PPTP pass-through option in order to get this to work. Most routers do. Ask XO about forwarding IP protocol 47.
 
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