Network Host Status
A report of ARPANET host status from June 5 through June 16, 1972.
Westheimer, E., "Network Host Status", RFC 362, DOI 10.17487/RFC0362, June 1972, <https://www.rfc-editor.org/info/rfc362>.
@misc{rfc362,
series = {Request for Comments},
number = 362,
howpublished = {RFC 362},
publisher = {RFC Editor},
doi = {10.17487/RFC0362},
url = {https://www.rfc-editor.org/info/rfc362},
author = {E. Westheimer},
title = {{Network Host Status}},
pagetotal = 4,
year = 1972,
month = jun,
} RFC text
Network Working Group Ellen Westheimer
NIC #10604 BBN
RFC #362 28 June 1972
Categories: F, G.3
Updates: RFC #353
Obsoletes: None
NETWORK HOST STATUS
This RFC reports on the status of most Network Hosts from June 5
to June 16. During this period the MIT Math Lab PDP-10 (Network
address 198) became a server.
No testing was done on June 6 due to an attempt to install the
new IMP system. No testing was done on June 9 as the prototype
Terminal IMP was being used for software debugging.
On June 16 the ARPA Terminal IMP (Network 156) was installed in
Arlington, Virginia.
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).
2) 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, NOAA, RADC, SAAC, BELVOIR, ARPA, 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:
Network
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.
STATUS OR
SITE PREDICTIONS
ADDRESS SITE COMPUTER STATUS OR PREDICTION OBTAINED FROM
------- ---- -------- -------------------- -------------
1 UCLA SIGMA-7 Server #Limited Jon Postel
65 UCLA IBM-360/91 NETRJS now Bob Braden
(Telnet in June)
2 SRI (NIC) PDP-10 Server Jim White
66 SRI (AI) PDP-10 Server Len Chaiten
3 UCSB IBM-360/75 Server Ron Stoughton
4 UTAH PDP-10 Server Barry Wessler
*5 BBN (NCC) DDP-516 Never Alex McKenzie
69 BBN (TENEX-A) PDP-10 Server Dan Murphy
133 BBN (TENEX-B) PDP-10 Server(Exper.) Dan Murphy
6 MIT (Multics) H-645 Server Mike Padlipsky
70 MIT (DM) PDP-10 Server Bob Bressler
134 MIT (AI) PDP-10 Server Jeff Rubin
198 MIT (ML) PDP-10 Server Jeff Rubin
*7 RAND IBM-360/65 User Only Eric Harslem
71 RAND PDP-10 Server Eric Harslem
8 SDC IBM-370/155 Server Bob Long
9 HARVARD PDP-10 Server Bob Sundberg
*73 HARVARD PDP-1 User Only Bob Sundberg
10 LINCOLN IBM-360/67 "Soon" Joel Winett
74 LINCOLN TX-2 Server Will Kantrowitz
11 STANFORD PDP-10 Server Andy Moorer
*12 ILLINOIS PDP-11 User Only John Cravits
*13 CASE PDP-10 June Charles Rose
14 CARNEGIE PDP-10 Server Hal VanZoeren
15 AMES ILLIAC Server John McConnell
(PDP-10)
16 AMES IBM-360/67 "Soon" Wayne Hathaway
*144 AMES TIP User Only
*145 MITRE TIP User Only
*146 RADC TIP User Only
*19 NBS PDP-11 User Only Robert Rosenthal
*147 NBS TIP User Only
*148 ETAC TIP User Only
*23 USC IBM-360/44 User Now James Pepin
*151 USC TIP User Only
*152 GWC TIP User Only
*153 NOAA TIP User Only
*154 SAAC TIP User Only
*156 ARPA TIP User Only
*158 BBN TIP User Only
(Prototype)
______________
*Host not included in daily testing.
#The NMC is a research site and would like to have prior arrangement
with each user.
NO. SITE DATE AND TIME (EASTERN)
--- ---- -----------------------
6/5 6/7 6/8 6/12 6/13 6/14 6/15 6/16
1330 1600 1200 1530 1230 1100 1230 1700
1 UCLA-NMC O O O O O #D O O
65 UCLA-CCN* O O O O O #D O O
2 SRI-ARC O D D O O O O O
66 SRI-AI O D T D D D #D D
3 UCSB-MOD75 O O O O O O O O
4 UTAH-10 0 O O D D O D O
69 BBN-TENEX D O O O O O O O
133 BBN-TENEXB #D #D #D #D #D #D #D #D
6 MIT-MULTICS O O O O O O O O
70 MIT-DMCG O O O O O O O O
134 MIT-AI H H H H H H H H
194 MIT-ML D D H D H H D H
71 RAND-CSG O D O D O O O O
8 SDC-ADEPT #D #D #D #D #D #D #D D
9 HARVARD-10 O O O O #D #D #D O
10 L.L.-360 H D H D H H H H
74 L.L.-TX-2 R #D O O O #D O O
11 STANFORD-AI D D O O O O D D
14 CMU-10 D O O O O T O O
15 AMES-ILLIAC T O O O D O O O
16 AMES-67 D D D D D D D D
where
D = Dead (Destination Host either dead or inaccessible [due to network
partitioning or local IMP failure] from the BBN Terminal IMP.)
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 users.)
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 within 60 seconds.)
_______________
*The only service currently offered by the UCLA IBM-360/91 is a Network
Job Service (NETRJS), however, the BBN Terminal IMP is not equipped to
test NETRJS. We are assuming that initial connection to the NETRJS
logger indicates that NETRJS is also functioning.
#These sites advertise that they may not have their system available at
these times.
[ 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 ]
ISO Plain Language
On this page
§1Host Status and Installations
The report covers most Network Hosts from June 5 to June 16. During this period, the MIT Math Lab PDP-10, Network Address 198, became a server. The ARPA Terminal IMP, Network 156, was installed in Arlington, Virginia, on June 16.
No testing was done on June 6 during an attempt to install the new IMP system. No testing was done on June 9 because the prototype Terminal IMP was being used for software debugging.
The MIT Math Lab PDP-10 became a server, and an ARPA Terminal IMP was installed. Two dates have no test results because of installation work and software debugging.
§2Daily Host Test Results
The daily table records host responses using O for Open, D for Dead, H for Half Open, R for Refused, T for Timed out, and F for Full. Full means a host opened a connection, reported that all Network ports were in use, and immediately closed the connection.
A timed-out host did not complete the ICP and open a connection within 60 seconds. The report also marks sites that said their systems might not be available at those times.
The codes describe whether each host opened, refused, or failed to complete a connection. A timeout means the host did not open within 60 seconds.
§3Excluded Hosts and Reported Roles
Hosts intended to be users only, including Terminal IMPs and the Network Control Center, were excluded from daily testing. The report also shows a separate table of host roles and predictions, including servers, user-only systems, and systems expected to become servers.
The memo identifies the BBN Terminal IMP as a prototype that was frequently disconnected while its programs were being refined and debugged.
The report does not test every system daily. It explains that user-only equipment and the prototype BBN Terminal IMP were excluded for different reasons.