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LinuxDig.com Request For Comments

RFC Number : 94

Title : Some thoughts on Network Graphics.






Network Working Group A. McKenzie
Request for Comments #93 BBN
Updates RFC's 66, 80 January 1971


Initial Connection Protocol


A review of the Initial Connection Protocol (ICP) first
described in RFC #66 and restated in RFC #80 has revealed an area of
ambiguity, which in turn reflects an ambiguity in the Host-Host
Protocol Document No. 1. This is the definition of the message sent
over the connection from 'Server socket #1'. In both referenced
RFC's, the message is defined as 'exactly an even 32 bit number'. It
is not clear, however, whether this 32 bit number is meant to follow
an eight-bit 'message data type' code or not, stemming from the fact
that the Host-Host Protocol makes provision for such codes but does
not seem to absolutely demand them.

Only one implementation of an ICP has been documented in the
NWG literature - that at UCSB (RFC #74). The implementers of this ICP
have apparently interpreted the Host-Host Protocol as demanding a
message data type code, and therefore do transmit a code of zero.

Steve Crocker indicates (private communication) that the Host-
Host Protocol was intended to require a message data type code. We
therefore recommend that RFC numbers 66 and 80 be amended to show that
the 'even 32 bit number' is preceded by a message data type code of
zero (zero is the only code currently defined).


[ This RFC was put into machine readable form for entry ]
[ into the online RFC archives by James Thompson 4/97 ]


















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