Intended status: Standards Track A.Eromenko September 2016

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"TCP 64-bit extension: Modern Variation",
Alexey Eromenko, 2016-09-29, 
expiration date: 2017-03-29

Intended status: Standards Track
                                                          September 2016

                  TCP 64-bit extension: "Modern Variation"
                    for Internet Protocol - Five Fields


   This document attempts to modernize TCP protocol for new reality,
   faster bandwidth, encryption-optimization and optional checksums,
   which is required for Identity-Locator Network Protocol (ILNP) 
   This extension is backwards compatible with the original TCP 
   specification during session establishment, but not compatible 
   during the rest of the session nor with deployed middleboxes.

Status of This Memo

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   Copyright (c) 2015 IETF Trust and the persons identified as the
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Table of Contents

   1. TCP Header: "Classic variation"
   2. TCP Header: "Modern variation" a.k.a TCP.64
   2.1. TCP Header: "Modern variation without CRC"
   3. Initiating a TCP.64 Session "Modern Variation"
   4. TCP.64 "Modern Variation" establishment options
   4.1. TCP.64 Session option: Modern Maximum Segment Size
   4.2. TCP.64 Session option: Modern window scaling
   4.3. TCP.64 Session option: Checksum ignored
   Authors' Contacts


   TCP in IP-FF comes in several variations, of flavors.
   The questions is:
   Our operating systems and processors are 64-bit.
   Why not make TCP 64-bit also ?
   Well, I decided to define what TCP 64-bit should look like.

   The session begins with the good-old, time-tested 
   "Classic variation", which looks familiar. 
   Just Port fields have moved to the "IP" layer.
   ...and only during SYN/ACK, it MAY be moved to a different variation.

1. TCP Header: "Classic variation"

    0                   1                   2                   3   
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 
  4|                        Sequence Number                        |
  8|                    Acknowledgment Number                      |
 12|  Data |     |N|C|E|U|A|P|R|S|F|                               |
   | Offset|     |S|W|C|R|C|S|S|Y|I|            Window             |
   |       |     | |R|E|G|K|H|T|N|N|                               |
 16|           Checksum            |         Urgent Pointer        |
   |                    Options                    |    Padding    |
   |                             data                              |

   Few differences between original TCP and TCP/IPFF "classic":

   a. Ports have moved to IPFF layer.

   b. Checksum needs to be computed using the new pseudo-header,
      according to [IPFF] specification.
      But using the old checksum algorithm (not CRC); This is to allow
      TCP/IPFF to function fairly fast on old processors.
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