HIERARCHICAL CABLE MODEM CLONE DETECTION
First Claim
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1. ) A method comprising the steps of:
- detecting if a cable modem seeking connection (CM-SC) to a first cable modem termination system (CMTS) has the same media access control (MAC) address as any cable modems previously registered (PR-CM) on said first CMTS,if said CM-SC has the same MAC address as a PR-CM, determining if the location of CM-SC is the same as that of the PR-CM, andif said locations differ, sending a ping to the location of said PR-CM, whereby if said PR-CM responds to said ping, it is determined that said CM-SC is a clone and if said PR-CM does not respond to said ping, it is determined that said CM-SC is in fact said PR-CM at a new location.
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Abstract
A hierarchical cable modem clone detection system: A cable modem clone detection system uses a cable modem media access control (MAC) address and physical location information such as information relating to a cable interface, upstream and downstream port numbers, fiber node information, and load balancing group descriptors to determine if a cable modem is a clone. The hierarchical approach first make a clone determination at a cable modem termination system, then at a regional operations center and finally at a network operations center
65 Citations
22 Claims
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1. ) A method comprising the steps of:
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detecting if a cable modem seeking connection (CM-SC) to a first cable modem termination system (CMTS) has the same media access control (MAC) address as any cable modems previously registered (PR-CM) on said first CMTS, if said CM-SC has the same MAC address as a PR-CM, determining if the location of CM-SC is the same as that of the PR-CM, and if said locations differ, sending a ping to the location of said PR-CM, whereby if said PR-CM responds to said ping, it is determined that said CM-SC is a clone and if said PR-CM does not respond to said ping, it is determined that said CM-SC is in fact said PR-CM at a new location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. ) A method comprising:
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storing in a memory associated with a cable modem termination system (CMTS) the media access control (MAC) address and location of cable modems previously registered on said CMTS system, determining the current MAC address and the current location of a cable modem that attempts to connect to said CMTS system, determining if any of said previously registered cable modems had the same MAC address as said current MAC address, and if a previously registered cable modem had the same address as said current MAC address, retrieving from said memory the location of the previously registered cable modems that had the same MAC address as said current MAC address, and comparing the location of the previously registered cable modems that had the same MAC address as said current MAC address to said current location and if said compared addresses differ, sending a ping to the location of said previously registered cable modem to determine if two modems with the same MAC address are connected to said CMTS or if said PR-CM has moved to a new location. - View Dependent Claims (11, 12)
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13. A method to detect a cloned cable modem comprising:
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establishing a connection from a particular cable modem to a cable modem termination system (CMTS), said CMTS storing medial access control (MAC) addresses of modems to which connects are established and the associated physical location modems whose MAC address is stored; checking if a MAC address for said particular cable modem and an associated physical location is stored in said CMTS; if said MAC address is stored in said CMTS, determining if the associated physical location of said particular cable modem is the same as the physical location stored of the same MAC address stored in said CMTS, whereby a determination can be made as to whether or not said particular modem may be a clone. - View Dependent Claims (14, 15, 16, 17)
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18. A method of detecting if a cable modem seeking connected (CM-SC) to a CMTS is a clone comprising the steps of:
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storing is said CMTS the MAC address and location of cable modems registered with said CMTS (PR-CM), determining the MAC address and location of said CM-SC, comparing the location of said CM-SC to the location of any PR-CM having the same MAC address as said CM-SC, if said locations differ, sending a ping to the location of said PR-CM, whereby if said PR-CM responds to said ping, it is determined that said CM-SC is a clone and if said PR-CM does not respond to said ping, it is determined that said CM-SC is in fact said PR-CM at a new location.
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19. ) The method recited in claim 19 wherein said ping is a ping that verifies the DOCSIS path of said CM-SC.
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20. ) A system including,
a cable modem termination system (CMTS) that includes a memory to store the MAC address and location of cable modems previously registered (PR-CM) on said CMTS, a processor to (a) determine the MAC address and location of cable modems seeking connection (CM-SC) to said CMTS, (b) compare the location of said CM-SC to the location of any PR-CM having the same MAC address as said CM-SC, and (c) if said locations differ, sending a ping to the location of said PR-CM, whereby if said PR-CM responds to said ping, it is determined that said CM-SC is a clone and if said PR-CM does not respond to said ping, it is determined that said CM-SC is in fact said PR-CM at a new location.
Specification