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vpn on win xp

By carlosmerce57 ·
I want to conect my home pc at work with VPN
My office has a lan trougth out a US Robotic router model 8000-02 that does suport VPN shearing a dsl internet conecction ok.
I follow directions from this MS url;EN-US;314076
but I still get this error when I try to connect:
Error 800: Unable to establish connection.
On the same url I found this article:
If you use a personal firewall or a broadband router, or if there are routers or firewalls between the VPN client and the VPN server, the following ports and protocol must be enabled for PPTP on all firewalls and routers that are between the VPN client and the VPN server:

Client ports Server port Protocol
1024-65535/TCP 1723/TCP PPTP

Additionally, you must enable IP PROTOCOL 47(GRE)

Question: how do I enable IP PROTOCOL 47 (GRE).
and do I should use the client port on the router as a triger ports ?...
Im a user with no training at all everything I know is by trying diferent ways...
Thanks Carlos

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Firstly you do this

by noelokell In reply to vpn on win xp

OK, connect via PPTP is easiest. You do not need to enable any ports for outgoing calls to the internet, this is only required if you are expecting call to your home PC. Make sure your DHCP scope is set to a different subnet than what you work LAN has. Make sure you firewall at the work end has a VPN client installed and configured to accept incoming calls. Setup a user ID and Password. This should get you going, it's not hard once you get the idea.

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