Network host status
A snapshot of which ARPANET computers were working in mid-July 1972.
Westheimer, E., "Network host status", RFC 367, DOI 10.17487/RFC0367, July 1972, <https://www.rfc-editor.org/info/rfc367>.
@misc{rfc367,
series = {Request for Comments},
number = 367,
howpublished = {RFC 367},
publisher = {RFC Editor},
doi = {10.17487/RFC0367},
url = {https://www.rfc-editor.org/info/rfc367},
author = {E. Westheimer},
title = {{Network host status}},
pagetotal = 4,
year = 1972,
month = jul,
} RFC text
Network Working Group Ellen Westheimer
Request for Comments: 367 BBN
NIC #11014 19 July 1972
Category: F, G.3
Updates: 366
Obsoletes: None
NETWORK HOST STATUS
This RFC reports on the status of most Network Hosts from July 3 to
July 14.
No testing was done on July 4 as BBN took a holiday to celebrate
Independence Day. No testing was done on July 11 and 12 as I was on
vacation.
Several Hosts are currently excluded from the daily testing as they
are presently intended to be users only. Included here are the
Terminal IMPs, which are presently in the Network (AMES, MITRE, RADC,
NBS, ETAC, USC, GWC, NOAA, SAAC, 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
138 Lincoln TSP
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.
NO. SITE DATE AND TIME (EASTERN)
7/3 7/5 7/6 7/7 7/12 7/13 7/14
1730 1200 1700 1630 1600 1700 1400
1 UCLA-NMC O H H O O O O
65 UCLA-CCN* D #D O O O O O
2 SRI-ARC O D D O O O O
66 SRI-AI D #D O O O D O
3 UCSB-MOD75 D O O O O O D
4 UTAH-10 D O O O O O D
69 BBN-TENEX H O O O O O F
133 BBN-TENEXB #D #D #D #D #D #D #D
6 MIT-MULTICS O O O O O O O
70 MIT-DMCG O O O O O F H
134 MIT-AI O O O O O O O
194 MIT-ML H O O O O O O
71 RAND-CSG D O O O O O O
8 SDC-ADEPT D #D D D #D D #D
9 HARVARD-10 O #D #D O O #D O
10 L.L.-360 D H H H H D H
74 L.L.-TX-2 #D O O O O O D
11 STANFORD-AI O O R O O O O
13 CASE D D D D D D D
14 CMU-10 O D O D D O D
15 AMES-ILLIAC D D D D O O D
16 AMES-67 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.
STATUS OR
SITE STATUS PREDICTIONS
ADDRESS SITE COMPUTER OR PREDICTIONS OBTAINED FROM
------- ---- -------- ---------------- ---------------
UCLA SIGMA-7 Server #Limited Jon Postel
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-370/15 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
*138 LINCOLN TSP User Only Tom Barkelow
11 STANFORD PDP-10 Server Andy Moorer
*12 ILLINOIS PDP-11 User Only John Cravits
*13 CASE PDP-10 July 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.
[This RFC was put into machine readable form for entry]
[into the online RFC archives by H�l�ne Morin, Viag�nie, 12/99]
AI ELI5
On this page
§1Introduction
This RFC reports on the status of ARPANET host computers from July 3 to July 14, 1972. Testing was skipped on July 4 (Independence Day holiday) and July 11-12 (the author was on vacation).
The report explains which hosts were included in daily testing and which ones were excluded because they were user-only machines or Terminal IMPs not expected to host services.
This is a checklist of which big computers on the network were working during mid-July, skipping a few days when no one was there to check.
§2Excluded Hosts
Terminal IMPs at AMES, MITRE, RADC, NBS, ETAC, USC, GWC, NOAA, and SAAC were excluded because they were user-only machines, not servers. The Network Control Center (address 5) was also excluded because it only gathered statistics. Additionally, Rand (7), Harvard (73), Lincoln TSP (138), Illinois (12), NBS (19), and USC (23) were designated as users-only and not included in regular testing.
This distinction meant the network had different expectations for these machines: they were clients using network services, not providers of services to others.
Some machines were excluded because they were just using the network for themselves, not offering services to other machines.
§3Test Results
BBN's Terminal IMP tested each host multiple times during the testing days. Status codes included: O (Open: connected and accessible), D (Dead: unreachable), T (Timed out: no response within 60 seconds), H (1/2 Open: connected but closed immediately), F (Full: host said all ports were in use), and R (Refused: host rejected the connection).
The results show typical patterns: reliable hosts like MIT-Multics were open most days, while others like AMES-67 and CASE were dead nearly every day tested.
The test marked each computer with letters: O meant it was awake, D meant it was off, and other letters showed different problems like the computer being too busy.
§4Status Today
This RFC was replaced by RFC 370, which continued the weekly network status tradition. Host status reports remained a regular feature of ARPANET operations.
This report was just for two weeks. Later reports kept coming out regularly to help network users find available computers.