RFC 117 (rfc117) - Page 1 of 5

Some comments on the official protocol

Alternative Format: Original Text Document
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Network Working Group                                          J. Wong
Request for Comments: 117                                         UCLA
NIC #5826                                                 7 April 1971


                 Some Comments on the Official Protocol

               [Categories B.1, C.1, C.2, C.3, C.4, C.5]


 Document No. 1 and NWG/RFC No. 107 gave a very detailed description of
connection establishment, connection termination and flow control over
the Network.  Throughout the implementation of the NCP it was
discovered that the handling of ERR control commands, messages of
types other than 0 (regular), 4 (nop), and 5 (rfnm), and messages with
the From-imp bit on are not well discussed so that problems arise when
they occur.

The Protocol is not complete if the above situations are not handled
clearly, and the Host-Host Protocol Glitch Cleaning Committee should
take this into consideration.  In this document, experience with these
unfavorable situations and suggestions for handling are given:


1.  ERR Control Commands

In Document No. 1, the following error conditions are described:

     a.  Illegal Op. code.
     b.  End of message encountered before all expected parameters.
     c.  Bad socket polarity within commands.
     d.  Link number not in the range of 0
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