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Secure DHCP processing for layer two access networks

  • US 8,862,705 B2
  • Filed: 07/30/2009
  • Issued: 10/14/2014
  • Est. Priority Date: 07/30/2009
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving a layer two domain identifier of a layer two domain in which a first subscriber device resides;

    storing an association between the layer two domain identifier of the first subscriber device and a layer two address of the first subscriber device;

    comparing a layer two domain identifier and a layer two address of a second subscriber device attempting to acquire a layer three address with the layer two domain identifier and the layer two address of the first subscriber device;

    denying a layer three address to the second subscriber device based on the comparison if the first subscriber device and the second subscriber device share the same layer two address and share the same layer two domain identifier; and

    offering the second subscriber device a layer three address based on the comparison if the first subscriber device and the second subscriber device share the same layer two address but have different layer two domain identifiers.

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