System and method for detecting and reporting cable modems with duplicate media access control addresses
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United States of America Patent
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Sep 18, 2007
Issued Date -
N/A
app pub date -
Dec 20, 2002
filing date -
Dec 20, 2002
priority date (Note) -
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Abstract
The detection of devices with duplicate media access controller (MAC) addresses in a cable network. A cable modem (CM) having a MAC address is connected by the cable network to a cable modem termination system (CMTS) having a gateway interface address. A centralized storage of historical cable modem MAC address/giaddr pair data is used to identify cable modems (CM's) that report duplicate MAC addresses. A server tracks the CM MAC address/giaddr pair data of all CM requests that it receives and stores the MAC address/giaddr pair data into a datastore (such as a database). When a CM seeks to access the network, the server looks into the datastore to determine whether the CM MAC address of the CM has previously been stored with a different associated giaddr, which would imply that there are multiple CMs attached to different CMTSs where the CMs share the same MAC address. If such duplication is detected, a appropriate remedial response is taken.
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