Problem with VPN connection from a connection shared cable modem

Couple of my users on a remote site share a modem cable connection using a Linksys 4 port router. They connect to the main campus using VPN. When the two try to connect via VPN to the only main campus can connect at the same time. We have VPN 3015 concentrator on the main campus and the user is authenticated on our active directory. The machines of users has windows XP pro and use Microsoft VPN to connect. Anyone encountered this before? No solution/work around?

Thank you.

-Nik

I suspect that the problem is to do with NAT / PAT - if only a customer wants to create a VPN session to the 3015, NAT is used, but if several clients go through your Linksys router, then you are using PAT, that requires NAT t (nat transparency), see the following URL for more information:- http://support.microsoft.com/default.aspx?scid=kb;en-us;818043

Rowan

Tags: Cisco Security

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