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System and method for source IP anti-spoofing security

  • US 7,979,903 B2
  • Filed: 02/25/2009
  • Issued: 07/12/2011
  • Est. Priority Date: 05/21/2003
  • Status: Active Grant
First Claim
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1. A method comprising:

  • determining, by a network device, whether a source IP address included in a data packet received on a port of the network device is stored in a table of the network device; and

    if the source IP address is not stored in the table;

    determining, by the network device, whether a number of source IP addresses stored in the table for the port equals or exceeds a maximum number of source IP addresses predetermined for the port; and

    if the number of source IP addresses stored in the table for the port does not equal or exceed the maximum number;

    determining, by the network device, whether a MAC address included in the data packet is stored in the table; and

    if the MAC address is not stored in the table;

    learning, by the network device, the source IP address; and

    storing, by the network device, the MAC address and the source IP address in the table.

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