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From: kasten@EUROPA.INTERLAN.COM (Frank Kastenholz)
Newsgroups: comp.protocols.tcp-ip
Subject: Re:  IP Header Checksum Calculation
Message-ID: <9101301334.AA03772@europa.InterLan.Com>
Date: 30 Jan 91 13:34:54 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 9

Brian,
look at:

RFC 1071  Braden, R.T.; Borman, D.A.; Partridge, C.  Computing the Internet
          checksum.  1988 September; 24 p. (Format: TXT=54941 bytes)  (Updated by
          RFC 1141)
      
Frank Kastenholz
Racal Interlan