VPN, Ports and Windows 2000 RRAS

Hi all,

I have just installed and configured a windows 2000 server to serve as a VPN server.

I have a question regarding what ports will this type of setup require that i open so VPN connections can be forwaded past my linux firewall (smoothwall) are there standard VPN ports that should be used/are used?


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Rob WilliamsCommented:
This depends on the type of Windows VPN you have set up, or rather what protocols you have chosen to use. A standard Windows PPTP VPN requires only TCP port 1723 be forwarded to the VPN server, also GRE which is protocol 47 (not port 47), must be allowed to pass.

If you are using L2TP with IPSec then you will need UDP port 1701 for L2TP traffic and UDP port 500 for IKE. With IPSec you also need to allow ESP & AH protocols 50 and 51 to pass.  

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CyberIDentityAuthor Commented:
How do you allow GRE to pass does it have a port?
Rob WilliamsCommented:
I was afraid you would ask that. :-)
I am lost with Linksys firewalls, last one I used was LRP that ran from a floppy. GRE (Generic Route Encapsulation) is not a port but rather a security protocol.  http://support.microsoft.com/?kbid=241251
On most routers you have the ability to enable GRE, PPTP, or VPN pass-through which will accomplish the task. I am not familiar with Smoothwall, though I have had a CD with it on my desk here for a year or more, meaning to experiment with it, but can't tell you how to configure GRE pass-through. I did find the following which may be of some help:
CyberIDentityAuthor Commented:
thanks for responding, i will look into this more, appreciate the help
Rob WilliamsCommented:
Thanks CyberIDentity. Good luck,
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