06816462 is referenced by 100 patents.

A method and system for determining the connectivity of a virtual private network IP security (IPSec) tunnel between two network elements by originating a plurality of connection tests between the network elements. The first network element transmits a connectivity test message to the second network element over the secure tunnel upon receipt of an initiate connectivity test command. The secure tunnel includes two unidirectional tunnels. The second network element receives the connectivity test message over the first unidirectional secure tunnel and transmits a response back to the first network element over the second unidirectional secure tunnel. The number of successful responses received from the second network element are accumulated and the results are reported back to the source of the connectivity test command.

Title
System and method to determine connectivity of a VPN secure tunnel
Application Number
9/630794
Publication Number
6816462 (B1)
Application Date
August 2, 2000
Publication Date
November 9, 2004
Inventor
Xiaogang Wang
Dublin
OH, US
Leo Temoshenko
Raleigh
NC, US
Phuong Thanh Nguyen
Cary
NC, US
Charles Steven Lingafelt
Durham
NC, US
Earl Hardin Booth III
Durham
NC, US
Agent
Gerald R Woods
US
Assignee
International Business Machines Corporation
NY, US
IPC
H04L 12/26
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