Interactive video distribution systems – Video distribution system with upstream communication – Having link to external network
Reexamination Certificate
2007-09-18
2007-09-18
Arani, Taghi (Department: 2131)
Interactive video distribution systems
Video distribution system with upstream communication
Having link to external network
C725S025000, C725S030000, C725S115000, C726S023000, C726S024000
Reexamination Certificate
active
10325269
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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Gould Kenneth
Williams Chris
Arani Taghi
Roberts Mardula & Wertheim LLC
Sherkat Arezoo
Time Warner Cable, a division of Time Warner Entertainment Compa
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