Patents by Inventor William J. Shugard

William J. Shugard 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).

  • Detection of routing loops based on time-to-live expiries
    Patent number: 8045460
    Abstract: A method and system for detecting routing loops and time-to-live (TTL) expiry attacks in a telecommunications network are disclosed. The detection of routing loops and TTL expiry attacks can be achieved based on the comparison of TTL expiries occurring on two or more routers in the network. A quantity of TTL expiries associated with a router can be summed. Additionally, a quantity of TTL expiries associated with other routers that are operatively coupled to the router can be summed. A difference between the sums can be calculated and a determination of whether a routing loop exists can be made in response to the difference.
    Type: Grant
    Filed: May 13, 2010
    Date of Patent: October 25, 2011
    Assignee: AT&T Intellectual Property I, LP
    Inventors: Thusitha Jayawardena, William J. Shugard
  • DETECTION OF ROUTING LOOPS BASED ON TIME-TO-LIVE EXPIRIES
    Publication number: 20100242113
    Abstract: A method and system for detecting routing loops and time-to-live (TTL) expiry attacks in a telecommunications network are disclosed. The detection of routing loops and TTL expiry attacks can be achieved based on the comparison of TTL expiries occurring on two or more routers in the network. A quantity of TTL expiries associated with a router can be summed. Additionally, a quantity of TTL expiries associated with other routers that are operatively coupled to the router can be summed. A difference between the sums can be calculated and a determination of whether a routing loop exists can be made in response to the difference.
    Type: Application
    Filed: May 13, 2010
    Publication date: September 23, 2010
    Applicant: AT&T LABS, INC.
    Inventors: Thusitha Jayawardena, William J. Shugard
  • Detection of routing loops based on time-to-live expiries
    Patent number: 7752666
    Abstract: A method and system for detecting routing loops and time-to-live (TTL) expiry attacks in a telecommunications network are disclosed. The detection of routing loops and TTL expiry attacks can be achieved based on the comparison of TTL expiries occurring on two or more routers in the network. A quantity of TTL expiries associated with a router can be summed. Additionally, a quantity of TTL expiries associated with other routers that are operatively coupled to the router can be summed. A difference between the sums can be calculated and a determination of whether a routing loop exists can be made in response to the difference.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: July 6, 2010
    Assignee: AT&T Labs, Inc.
    Inventors: Thusitha Jayawardena, William J. Shugard
  • DETECTION OF ROUTING LOOPS BASED ON TIME-TO-LIVE EXPIRIES
    Publication number: 20090161567
    Abstract: A method and system for detecting routing loops and time-to-live (TTL) expiry attacks in a telecommunications network are disclosed. The detection of routing loops and TTL expiry attacks can be achieved based on the comparison of TTL expiries occurring on two or more routers in the network. A quantity of TTL expiries associated with a router can be summed. Additionally, a quantity of TTL expiries associated with other routers that are operatively coupled to the router can be summed. A difference between the sums can be calculated and a determination of whether a routing loop exists can be made in response to the difference.
    Type: Application
    Filed: December 21, 2007
    Publication date: June 25, 2009
    Applicant: AT&T LABS, INC.
    Inventors: Thusitha Jayawardena, William J. Shugard