Patents by Inventor Paul J. Frantz

Paul J. Frantz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Use of cyclic redundancy checking for segregating control traffic
    Patent number: 7159123
    Abstract: A method of modifying the error detection code (EDC) generation and verification logic at both ends of a communications link in a data communications device or system so that user packets and control packets use different EDC algorithms to protect the communications device from control packet spoofing and interference by randomly-generated test data. Data packets are transmitted internally with a standard cyclic redundancy check (CRC) or other error detection coding scheme while control packets are given a different “control” EDC. At the receiving end of the link, the received packet is tested to determine whether the EDC matches the standard or control forms. If the EDC complies with neither of these two requirements, then the packet is discarded. If, however, the packet matches the control EDC but not the standard EDC, it is checked to see if the header is in the expected control format. If the control EDC is present but the header is incorrect, the packet is discarded.
    Type: Grant
    Filed: February 24, 2004
    Date of Patent: January 2, 2007
    Assignee: Cisco Technology, Inc.
    Inventor: Paul J. Frantz
  • Use of cyclic redundancy checking for segregating control traffic
    Patent number: 6697943
    Abstract: A method of modifying the error detection code (EDC) generation and verification logic at both ends of a communications link in a data communications device or system so that user packets and control packets use different EDC algorithms to protect the communications device from control packet spoofing and interference by randomly-generated test data. Data packets are transmitted internally with a standard cyclic redundancy check (CRC) or other error detection coding scheme while control packets are given a different “control” EDC. At the receiving end of the link, the received packet is tested to determine whether the EDC matches the standard or control forms. If the EDC complies with neither of these two requirements, then the packet is discarded. If, however, the packet matches the control EDC but not the standard EDC, it is checked to see if the header is in the expected control format. If the control EDC is present but the header is incorrect, the packet is discarded.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: February 24, 2004
    Assignee: Cisco Technology, Inc.
    Inventor: Paul J. Frantz