Additional negotiation in the TCP Timestamp Option field during the TCP handshake

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Last updated 2013-04-25 (latest revision 2012-10-22)
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A number of TCP enhancements in diverse fields as congestion control, loss recovery or side-band signaling could be improved by allowing both ends of a TCP session to interpret the value carried in the Timestamp option. Further enhancements are enabled by changing the receiver side processing of timestamps in the presence of Selective Acknowledgements. This document updates RFC1323 and specifies a backward-compatible method for negotiating for additional capabilities for the Timestamp option, and lists a number of benefits and drawbacks of this approach.


Richard Scheffenegger (
Mirja Kuehlewind (
Brian Trammell (

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