Network device that determines application-level network...

Details Network device that determines application-level network... Network device that determines application-level network...

2011-01-18

2011-01-18

Tran, Phuc (Department: 2471)

Multiplex communications

Communication over free space

Combining or distributing information via time channels

C370S503000

Reexamination Certificate

active

07873025

ABSTRACT:
A data processing apparatus in a network receives packet flows that are communicated between a first network node and a second network node, and comprises a clock and latency analysis logic configured for receiving a first data segment that has been communicated from the first node and forwarding the first data segment to the second node; storing a first time value of the clock in association with a first timestamp value obtained from the first data segment; receiving a second data segment that has been communicated from the second node and forwarding the second data segment to the first node; retrieving the first time value based on the first timestamp value; determining a second time value of the clock; and determining a first latency value by computing a difference of the second time value and the first time value. Thus end-to-end packet latency is determined by passively observing timestamp values.

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patent: 6421319 (2002-07-01), Iwasaki
patent: 2005/0071446 (2005-03-01), Graham et al.
patent: 2006/0239300 (2006-10-01), Hannel et al.
Information Sciences Institute, University of Southern California, “Transmission Control Protocol: DARPA Internet Program Protocol Specification,” Internet Engineering Task Force (IETF) Request for Comments (RFC) 793, Sep. 1981, pp. 1-88.
V. Jacobson et al., “TCP Extensions for High Performance,” IETF RFC 1323, May 1992, pp. 1-35.
C. Kalbfleisch et al., “Application Management MIB,” IETF RFC 2564, May 1999, pp. 1-81.
M. Lacy, “Remote Timing Techniques,” downloaded Sep. 28, 2005 from the Internet location “http://www.maurol.com.ar/security/rtt.pdf,” pp. 1-8.

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