Couple of my users at a remote location shares a cable modem connection using a Linksys 4 port router. They connect to main campus using VPN. When they both try to connect using VPN to the main campus only one can connect at a time. We have VPN concentrator 3015 on main campus and the user is authenticated against our active directory. The users machines has windows XP pro and are using the Microsoft VPN to connect. Has anyone run into this before? Any solution/workaround?
I suspect the problem is to do with NAT / PAT - If only one client wishes to create a VPN session to the 3015, then NAT is used, however if multiple clients are passing through your Linksys Router, then you are using PAT, which requires NAT -T (nat transparency), see the following URL for further info:- http://support.microsoft.com/default.aspx?scid=kb;en-us;818043
I suspect the problem is to do with NAT / PAT - If only one client wishes to create a VPN session to the 3015, then NAT is used, however if multiple clients are passing through your Linksys Router, then you are using PAT, which requires NAT -T (nat transparency), see the following URL for further info:- http://support.microsoft.com/default.aspx?scid=kb;en-us;818043
Thanks for the NAT-T info. The patch will work for the ipsec tunnels only though. Is there a workaround for the users connecting via native Microsoft VPN (L2TP/PPTP)with no Cisco vpn client installed on the user machine.
-Nik
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