i believe you will need to use port forwarding on the Comcast gateway, and forward the necessary VPN ports to the Windows Server's 10.1.10.x address. As to whether the Comcast gateway is actually able to forward those ports (GRE protocol packets might be an issue, for example), i am not certain. rendrenner
;s suggestion of obtaining a static IP would be another option; configure the Windows server with a second network interface & the Comcast static IP, and then let Windows listen on that interface for VPN requests.