The invention provides an access method and device for a communication terminal. The method comprises the steps of detecting an initialization distance measurement message sent by a target communication terminal; judging whether the target communication terminal is the communication terminal in a first name list or not according to the initialization distance measurement message after the initialization distance measurement message is detected, wherein the first name list is used for storing identification information of the communication terminals of which access is refused by a current CMTS (Cable Modem Terminal Systems) device; judging whether the target communication terminal is the communication terminal in a second name list or not if it is judged that the target communication terminal is not the communication terminal in the first name list, wherein the second name list is used for storing the identification information of the communication terminals of which access is allowed by the current CMTS device; and allowing the target communication terminal to access the current CMTS device if it is judged that the target communication terminal is the communication terminal in the second name list and controlling the target communication terminal to access the current CMTS device. The technical problem that in the prior art, the access of an illegal CM (Cable Modem) to the CMTS cannot be limited is solved.

Access method and device for communication terminal

A device, such as a cable modem or embedded media terminal adaptor that attempts to obtain unauthorized network services, is designated head end equipment, such as a CMTS, as being a ‘rogue’ device. Upon an initial range request from the rogue device, the CMTS responds with a continuing range command. Upon receiving each periodic range request transmitted from the rogue device during a periodic station maintenance opportunity, the CMTS responds with another continuing range command. Thus, the rogue device does not ever establish connection with the CMTS because an ACK message is not received back from the CMTS. Moreover, use of CMTS resources for processing request from rogue devices is minimized because the rogue device does not reinitialize its MAC after a predetermined period of time, which it would do if a periodic ranging opportunity was not scheduled.

Method and system for denying cable modem access to a broadband network

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Method and system for denying cable modem access to a broadband network