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RFC1624:Computation of the Internet Checksum via Incremental

落鹤生 发布于 2008-05-06 18:00 点击:次 
This memo describes an updated technique for incremental computation of the standard Internet checksum. It updates the method described in RFC 1141.
TAG:

Network Working Group                             A. Rijsinghani, Editor
Request for Comments: 1624                 Digital Equipment Corporation
Updates: 1141                                                   May 1994
Category: Informational

                  Computation of the Internet Checksum
                         via Incremental Update

Status of this Memo

   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.


Abstract

   This memo describes an updated technique for incremental computation
   of the standard Internet checksum.  It updates the method described
   in RFC 1141.

Table of Contents

   1. Introduction ..........................................  1
   2. Notation and Equations ................................  2
   3. Discussion ............................................  2
   4. Examples ..............................................  3
   5. Checksum verification by end systems ..................  4
   6. Historical Note .......................................  4
   7. Acknowledgments .......................................  5
   8. Security Considerations ...............................  5
   9. Conclusions ...........................................  5
   10. Author's Address .....................................  5
   11. References ...........................................  6

1.  Introduction

   Incremental checksum update is useful in speeding up several
   types of operations routinely performed on IP packets, such as
   TTL update, IP fragmentation, and source route update.

   RFC 1071, on pages 4 and 5, describes a procedure to
   incrementally update the standard Internet checksum.  The
   relevant discussion, though comprehensive, was not complete.
   Therefore, RFC 1141 was published to replace this description
   on Incremental Update.  In particular, RFC 1141 provides a
   more detailed exposure to the procedure described in RFC 1071.
   However, it computes a result for certain cases that differs
   from the one obtained from scratch (one's complement of one's
   complement sum of the original fields).

   For the sake of completeness, this memo briefly highlights key
   points from RFCs 1071 and 1141.  Based on these discussions,
   an updated procedure to incrementally compute the standard
   Internet checksum is developed and presented.

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