Extending the Space Available for TCP Options

Document Type Expired Internet-Draft (individual in tsv area)
Authors Wesley Eddy  , Adam Langley 
Last updated 2015-10-14 (latest revision 2008-07-01)
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state (None)
Document shepherd No shepherd assigned
IESG IESG state Expired (IESG: Dead)
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Responsible AD Lars Eggert
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes a method for increasing the space available for TCP options. Two new TCP options (LO and SLO) are detailed which reduce the limitations imposed by the TCP header's Data Offset field. The LO option provides this extension after connection establishment, and the SLO option aids in transmission of lengthy connection initialization and configuration options.


Wesley Eddy (weddy@grc.nasa.gov)
Adam Langley (agl@imperialviolet.org)

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