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Network Working Group                           Alex McKenzieRFC #374                                        BBNNIC 11099                                       19 July 1972There are two significant developments in the operation of the networkwhich should be of interest to all sites:NEW IMP SYSTEM IS RELEASED !   On Tuesday July 18, the new IMP software described in previous RFC's   (#331,#343,#359) was apparently successfully released.  We ran from   10:00am on that day until Wednesday afternoon with very few network   problems attributable to the new system.  We are quite pleased with   this performance, and expect to leave the new system up permanently!!   We are, of course, aware that in any system of this size, bugs may   crop up at any time, and we solicit the help of the network community   in finding them.  We also believe that the new system may have a   different "feel" to users, both terminal users and Hosts.  We urge   everyone to have a bit of patience while getting used to any change in   the "feel" of the network.  On the other hand, PLEASE REPORT ANY   SUSPECTED NETWORK MALFUNCTION TO THE NCC AS SOON AS POSSIBLE.   Evidence of bugs, guesses as to what went wrong, etc., are always   useful in hunting bugs, but don't let the lack of positive proof delay   the reporting of suspected system malfunction.  The NCC telephone   number is (617) 661-0100.  Feel free to call collect!   The one known shortcoming of the new software is the exacerbation of a   long-standing TIP software problem.  The TIP now often appears to   neglect sending an Allocate control message for some active   connection, with the effect that the Server-to-User path becomes   blocked.  We are giving the solution of this problem the highest   priority!  (Our current data seems to indicate that this problem is   most likely to occur when there are several users and when the Server   Host is a TENEX system.  If you know of other situations where this   problem has occurred, please let us know!)   Now that the new system is up, all sites with Model 516 IMPs will be   contacted by telephone and asked to reset the switches on their IMPs   as follows:             HALT INH         - on             W.D.T.           - on             AUTO RSTRT       - on             MEMORY PRTCT     - on                                                                [Page 1]

SITE POWER PROBLEMS   The network has recently been experiencing serious difficulties   related to the annual problem of more demand for electricity than is   available during the summer months.  For example:       During the month of June, between 1/4 and 1/2 of the       IMP down time was due to site power failure.       During the weekend of July 15-16, two sites were down       all weekend due to air-conditioning failure which was       apparently related to power failures or brownouts.       This left several sites connected to the rest of the       net through only one path which, according to Murphy's       law, eventually failed - leaving nine sites partitioned       from the remainder.       On July 18, an underground power transformer supplying       power to the entire computer room at site 27 failed,       putting IMP 27 out of action for several hours (anddit       could easily have been several weeks.)   Obviously in these cases there is little that either the NCC or the   site can do to restore service.  We expect these situations to   continue or even get worse as the summer continues.  Please try to   restrain your annoyance when these situations arise; we don't like   them either!       [ This RFC was put into machine readable form for entry ]       [ into the online RFC archives by BBN Corp. under the   ]       [ direction of Alex McKenzie.                      1/97 ]                                                                [Page 2]