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TCP SYN Extended Option Space Using an Out-of-Band Segment

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Dr. Joseph D. Touch , Ted Faber
Last updated 2023-04-25 (Latest revision 2022-10-22)
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)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document describes an experimental method to extend the option space for connection parameters within the initial TCP SYN segment, at the start of a TCP connection. This method effectively extends the option space of an initial SYN by using an additional coupled segment that is sent 'out-of-band'. It complements the proposed Extended Data Offset (EDO) option that is applicable only after the initial segment.


Dr. Joseph D. Touch
Ted Faber

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