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From: romkey@asylum.SF.CA.US (John Romkey)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: Pseudo headers in TCP/UDP checksum -- Why?
Message-ID: <1103@asylum.SF.CA.US>
Date: 17 Feb 89 23:01:31 GMT
References: <10010@pasteur.Berkeley.EDU>
Reply-To: romkey@asylum.SF.CA.US (John Romkey)
Organization: The Asylum; Belmont, CA
Lines: 12

In article <10010@pasteur.Berkeley.EDU> kiernan@sham.berkeley.edu
(Mike Kiernan) doesn't believe that the historical reason for the TCP
pseudoheader is to detect misrouted IP datagrams.

The keyword is "historical". It doesn't matter much now, but when the
first IP implementations were being written, people knew a lot less
about networking and layered protocols, and this was probably an
important consistency check for the first TCP/IP implementations.
-- 
			- john romkey
USENET/UUCP: romkey@asylum.sf.ca.us	Internet: romkey@xx.lcs.mit.edu
"Can you find me soft asylum..." - The Doors