US Patent 7752666 Detection of routing loops based on time-to-live expiries

Patent 7752666 was granted and assigned to AT&T Labs on July, 2010 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

AT&T Labs

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7752666

Date of Patent

July 6, 2010

Patent Application Number

11963039

Date Filed

December 21, 2007

Patent Primary Examiner

Chi H Pham

Patent 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.