NAT and proxy device detection

Details NAT and proxy device detection NAT and proxy device detection

2006-05-09

2008-10-07

Chan, Wing F. (Department: 2619)

Multiplex communications

Network configuration determination

C370S400000, C370S471000, C709S220000

Reexamination Certificate

active

07433325

ABSTRACT:
Multiple networked devices behind a NAT device are identified by sampling a proportion of data packets traversing the network and comparing the packet IP Identification fields. Depending on proximity of the values in different packets, each sampled packet is associated with one of currently known devices using the NAT, or identified with a newly recognized device.

REFERENCES:
patent: 6629137 (2003-09-01), Wynn
patent: 7243141 (2007-07-01), Harris
RFC 791, Internet Protocol, www.rfc-archive.org, Sep. 1981.
Steven M. Bellovin, “A Technique for Counting NATted Hosts”, http://www.cs.columbia.edu/˜smb/papers/fnat.pdf.

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