VPN Win2k & Eicon Diva ADSL router

[confusedchris]

I'm trying to set up a VPN connection through an Eicon Diva 2440 ADSL router (which uses NAT) with a Win2k server setup as the VPN server and attached directly to the router.

I've set (according to Microsoft instructions) NAT static routes on the router to allow access to ports 1723 & 47 which is needed by PPTP.

The problem I have is that when I dial up to the internet from the client (also Win2k using Microsoft's own inbuilt client)and try to login on the VPN connection, I am simply given an "Error 721 : The computer is not responding", which is very unhelpful and having searched out various reasons for this error (most of which seem to say that PPP is not responding on the server for some reason) I am not really any wiser.

I have a feeling it may be something to do with the router but having tried checking all settings & working to the Microsoft VPN white paper, I am nowhere nearer. I have seen on the Eicon website that the VPN client needs to be A UDP client which can work with NAT but I can't find anything helpful about that to do with the MS client.

Help?

thanks

chris

 

[confusedchris]

Its ok, I've solved it!

A quick call to Eicon sorted it out. for info for any others in the same position, simply change the default NAT server setting on the ADSL router config, to point to the IP address of your VPN server. This way any traffic that the router does not understand (ie. VPN traffic), gets forwarded to the VPN server and hey presto, everything works!

Apparently this is because Microsofts PPTP does not use standard TCP/UDP protocols, so although I set relevant ports TCP & UDP ports 1723 and 47 as a gateway through NAT, the server/router couldn't cope with this.

Chris