INTER-GATEWAY CLONED DEVICE DETECTOR USING PROVISIONING REQUEST ANALYSIS
First Claim
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1. An apparatus comprising circuitry configured to:
- inspect a provisioning request originating from a cable modem for a field added subsequent to transmission of the provisioning request from the cable modem;
analyze the added field for a value identifying a Cable Modem Termination System (CMTS);
determine whether a physical address for the cable modem is associated with another CMTS besides the CMTS identified by the value from the added field; and
output an indication of a cable modem cloning according to the determination.
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Abstract
In one embodiment, a cloned cable modem detector is configured to assemble a table associating cable modem physical addresses to Cable Modem Termination Systems (CMTSs) according to provisioning requests forwarded from the CMTSs. When one of the provisioning requests associates a cable modem physical address with a different CMTS than an existing association in the table, the detector outputs an indication of cable modem cloning.
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Citations
21 Claims
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1. An apparatus comprising circuitry configured to:
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inspect a provisioning request originating from a cable modem for a field added subsequent to transmission of the provisioning request from the cable modem; analyze the added field for a value identifying a Cable Modem Termination System (CMTS); determine whether a physical address for the cable modem is associated with another CMTS besides the CMTS identified by the value from the added field; and output an indication of a cable modem cloning according to the determination. - View Dependent Claims (2, 3, 5, 6, 7, 21)
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4. The apparatus of claim 4 wherein the circuitry is further configured to add an entry for the provisioning request to a table associating cable modems and CMTSs according to whether the MAC addresses are the same.
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8. An apparatus, comprising:
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means for receiving, over a network, provisioning requests originating from cable modems; means for assembling a table associating cable modem addresses with Cable Modem Termination Systems (CMTSs) according to relay fields attached to the received provisioning requests; means for comparing information from a newly received provisioning request to the table; and means for detecting and indicating cable modem cloning if the comparison indicates that a physical address for a cable modem is associated with more than one CMTS. - View Dependent Claims (9, 10, 11, 12)
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13. A method, comprising:
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formatting a table on a computing device to associate physical addresses with gateways; receiving, over a network, a provisioning request originating from a network device; comparing information from the provisioning request to the table, wherein the information is extracted from a relay field included in the provisioning request; and indicating cloning according to whether the comparison indicates that the network device is associated with more than one gateway. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification