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The TCP Service Number Option (SNO)

Document Type Expired Internet-Draft (individual)
Expired & archived
Author Dr. Joseph D. Touch
Last updated 2022-02-02 (Latest revision 2018-07-19)
Replaces draft-touch-tcp-portnames
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document specifies a TCP option for service numbers. The current SYN destination port is used both to indicate the desired service and as a connection demultiplexing field. This option separates those two functions, retaining the current destination port solely for demultiplexing and indicating the service separately in a service number option (SNO). By decoupling these two functions, SNO allows a larger number of concurrent connections for a single service, as might be useful between fixed addresses of proxies.


Dr. Joseph D. Touch

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