RFC 143 (rfc143) - Page 2 of 4

Regarding proffered official ICP

NWG                 Regarding Proferred Official ICP             RFC 143


                                               Required Predecessors
                                               ---------------------
Reference #   Action              Initiator   "Proferred"   Proposed
-----------   ------              ---------   -----------   --------

   13         Init(S,U+1,B )      Server           9           9
                          u

   14         RTS(S,U+1,'l' )     SNCP            13          13
                           2

   15         Init(S+1,U,B )      Server          13        14 and 18
                          s

   16         STR(S+1,U,B )       SNCP            15          15
                         s

   17         Init(U+1,S,B )      User            11          12
                          u

   18         STR(U+1,S,B )       UNCP            17          17
                         u

   19         Init(U,S+1,B )      User            17          17
                          s

   20         RTS(U,S+1,'l' )     UNCP            19          19
                           3

Note that in the Proferred Order column, 16 can occur before 12 in which
case UNCP would find socket U in use and probably return a CLS (U,S+1).
The Server would probably then assume the User was finished with the
conversation.

The above problem is resolved by eliminating the Close from one side and
causing that side to wait for the CLS from the other side before doing
an Init.  We propose that eliminating the user's Close (U) is the best
solution.  (The user NCP must of course return a CLS in response to the
CLS sent by the server NCP).

The Server's Close (L) leads more quickly to the reuse of socket L thus
the serving of another user.