Network Working Group
Request for Comments: 344
NIC #10423
Categories: F, G.3
Updates: RFC #342
Obsoletes: None
Ellen Westheimer
22 May 1972


This RFC reports on the status of most Network Hosts from
May 8 to May 19. No testing was done on May 15 due to the attempt to install the new IMP system on that day.

During this interval the PDP-10 of the MIT Artificial Intelligence Group (Network address 134) and the PDP-10 at Stanford (Network address 11) each became Network Servers.

Several Hosts are currently excluded from the daily testing. These Hosts fall into two categories:

  1. Hosts which are not expected to be functioning on the Network as servers (available for use from other sites) on a regular basis for at least two weeks. The only Host in this category is the PDP-10 at Case (Network address 13).
  1. Hosts which are currently intended to be users only. Included here are the Terminal IMPs, which are presently in the Network (AMES, MITRE, NBS, ETAC, USC, GWC, and BBN*). This category also includes the Network Control Center computer (Network address 5) which is used solely for gathering statistics from the Network. Finally, included among these Hosts are the following:
            Address              Site                   Computer
            -------              ----                   --------
               7                Rand                    IBM-360/65
              73                Harvard                 PDP-1
              12                Illinois                PDP-11
              19                NBS                     PDP-11
              23                USC                     IBM-360/44

The tables on the next two pages summarize the Host status for this period.
*The BBN Terminal IMP (Network Address 158) is a prototype and as such is frequently not connected to the Network, but being used to refine and debug the Terminal IMP programs.

F = Full (Destination Host opened a connection, informed user that all

Network ports were in use, and immediately closed the connection.)

H = 1/2 Open (Destination Host opened a connection but then either

immediately closed it, or did not respond any further.)

O = Open (Destination Host opened a connection and was accessible to


R = Refused (Destination Host returned a CLS to the initial RFC.)

T = Timed out (Destination Host did not complete the ICP and open a

connection with 60 seconds.)

           [This RFC was put into machine readable form for entry]
       [into the online RFC archives by BBN Corp. Alex McKenzie 12/96]