Cisco 851 and Motorola Surfboard cable modem ( SB4200) Share on Facebook Tweet on Twitter Share on LinkedIn Home › Forums › Networking › Cisco Routers & Switches How-to › Cisco 851 and Motorola Surfboard cable modem ( SB4200) This topic contains 0 replies, has 1 voice, and was last updated by is99 10 years, 10 months ago. Viewing 1 post (of 1 total) Author Posts is99Member December 26, 2007 at 7:04 am #129457 I have Motorola Surfboard cable modem ( SB4200) that uses PPTP or L2TP in order to connect to the ISP I need to configure the Cisco 851 to work with this cable modem. Sorry that my question sounds very stuped but how do I do it ? Thanks. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.