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Revealing hosts sharing an IP address using TCP option

Document type: Expired Internet-Draft (individual)
Document stream: No stream defined
Last updated: 2012-06-10 (latest revision 2011-12-08)
Intended RFC status: Unknown
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IESG State: Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found here:


When an IP address is shared among several subscribers -- with a NAT or with an application-level proxy -- it is impossible for the server to differentiate between different clients. Such differentiation is valuable in several scenarios. This memo describes a technique to differentiate TCP clients sharing an IP address. The proposed method uses a TCP option, which avoids altering the application-level payload and works well with SSL-protected connections.


Andrew Yourtchenko <>
Dan Wing <>

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid)