TCP Extended Data Offset Option
draft-ietf-tcpm-tcp-edo-06

Document Type Active Internet-Draft (tcpm WG)
Last updated 2016-06-28
Replaces draft-touch-tcpm-tcp-edo
Stream IETF
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TCPM WG                                                        J. Touch
Internet Draft                                                  USC/ISI
Updates: 793                                                   Wes Eddy
Intended status: Standards Track                            MTI Systems
Expires: December 2016                                    June 28, 2016

                      TCP Extended Data Offset Option
                      draft-ietf-tcpm-tcp-edo-06.txt

Status of this Memo

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   Copyright (c) 2016 IETF Trust and the persons identified as the
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Touch                 Expires December 28, 2016                [Page 1]
Internet-Draft     TCP Extended Data Offset Option            June 2016

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Abstract

   TCP segments include a Data Offset field to indicate space for TCP
   options but the size of the field can limit the space available for
   complex options such as SACK and Multipath TCP and can limit the
   combination of such options supported in a single connection. This
   document updates RFC 793 with an optional TCP extension to that
   space to support the use of multiple large options. It also explains
   why the initial SYN of a connection cannot be extending a single
   segment.

Table of Contents

   1. Introduction...................................................3
   2. Conventions used in this document..............................3
   3. Motivation.....................................................3
   4. Requirements for Extending TCP's Data Offset...................4
   5. The TCP EDO Option.............................................4
      5.1. EDO Supported.............................................5
      5.2. EDO Extension.............................................5
      5.3. The two EDO Extension variants............................8
   6. TCP EDO Interaction with TCP...................................9
      6.1. TCP User Interface........................................9
      6.2. TCP States and Transitions................................9
      6.3. TCP Segment Processing...................................10
      6.4. Impact on TCP Header Size................................10
      6.5. Connectionless Resets....................................11
      6.6. ICMP Handling............................................11
   7. Interactions with Middleboxes.................................12
      7.1. Middlebox Coexistence with EDO...........................12
      7.2. Middlebox Interference with EDO..........................13
   8. Comparison to Previous Proposals..............................14
      8.1. EDO Criteria.............................................14
      8.2. Summary of Approaches....................................15
      8.3. Extended Segments........................................16
      8.4. TCPx2....................................................16
      8.5. LO/SLO...................................................17
      8.6. LOIC.....................................................17
      8.7. Problems with Extending the Initial SYN..................18
   9. Implementation Issues.........................................19
   10. Security Considerations......................................20
   11. IANA Considerations..........................................20
   12. References...................................................20
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