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System and method for source IP anti-spoofing security

  • US 7,523,485 B1
  • Filed: 07/31/2003
  • Issued: 04/21/2009
  • Est. Priority Date: 05/21/2003
  • Status: Active Grant
First Claim
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1. A method for providing port security in a network device, the method comprising:

  • receiving a first data packet on a port of the network device, the first data packet including a first MAC address and a first source IP address;

    determining if the first MAC address is a new MAC address that is not included in a table of the network device, the table configured to store a plurality of source IP address and MAC address pairs;

    if the first MAC address is a new MAC address, learning the first source IP address, wherein the first MAC address and the first source IP address form a first source IP address and MAC address pair, and wherein said learning is delayed from a time of receipt of the first data packet until a predetermined amount of traffic has passed through the port;

    upon learning, storing the first source IP address and MAC address pair in the table; and

    using the table to control transmission of data packets through the port.

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