From: Christian Seberino <seberino@spawar.navy.mil>
To: netfilter@lists.netfilter.org
Subject: Why TCP does NOT have explicit LENGTH field like UDP & IP packets do!?!?
Date: Mon, 21 Nov 2005 09:46:11 -0800 [thread overview]
Message-ID: <1132595171.5180.98.camel@localhost.localdomain> (raw)
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I'm curious why TCP does not have an explicit length field like
UDP and IP packets do.
It appears from TCP RFC 793 that lower (IP) layer must provide
*some* way for TCP to figure out length. This is vague
and weird that length is handled this way.....
From RFC 793 page 50 with regards to layer below TCP...
"Any lower level protocol will have to provide the source address,
destination address, and protocol fields, and some way to determine
the "TCP length", both to provide the functional equivlent service
of IP and to be used in the TCP checksum."
Any ideas?
Chris
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reply other threads:[~2005-11-21 17:46 UTC|newest]
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