Status of Network Hosts
Network host status report for December 6 to 18, 1971
Westheimer, E., "Status of Network Hosts", RFC 287, DOI 10.17487/RFC0287, December 1971, <https://www.rfc-editor.org/info/rfc287>.
@misc{rfc287,
series = {Request for Comments},
number = 287,
howpublished = {RFC 287},
publisher = {RFC Editor},
doi = {10.17487/RFC0287},
url = {https://www.rfc-editor.org/info/rfc287},
author = {E. Westheimer},
title = {{Status of Network Hosts}},
pagetotal = 5,
year = 1971,
month = dec,
} RFC text
Network Working Group Ellen Westheimer
Request for Comments: #287 BBN
NIC: #8273 22 December 1971
Categories: F, G.3
Updates: RFC #267
Obsoletes: None
Status of Network Hosts
This RFC reports on the status of most Network Hosts from
December 6 to December 18. Due to hardware debugging, the BBN
prototype Terminal IMP (Network Address 158) was unavailable for most
of the two weeks from November 22 to December 6. There was, therefore,
no Host status reports for that period.
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. Included here are:
Network
Address Site Computer
------- ---- --------
133 BBN PDP-10 (B)
71 Rand PDP-10
13 Case PDP-10
15 Ames/(Paoli) ILLIAC/(B6500)
16 Ames IBM-360/67
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 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
The NBS Terminal IMP (Network Address 147) was installed in
Washington at the beginning of December.
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.
NETWORK
ADDRESS SITE COMPUTER DAY, DATE AND TIME (EASTERN)
------- ---- -------- ----------------------------
M Tu W Th F
12/6 12/7 12/8 12/9 12/10
1300 1700 1300 1300 1630
1 UCLA SIGMA-7 D O O H T
*65 UCLA IBM-360/91 H H D H H
2 SRI (NIC) PDP-10 D T D D D
66 SRI (AI) PDP-10 D D D D D
3 UCSB IBM-360/75 O D O R D
4 UTAH PDP-10 T D D D T
69 BBN PDP-10 D D D D T
6 MIT (Multics) H-645 O O O T O
70 MIT (DM) PDP-10 O O D D O
8 SDC IBM-360/67 #D #D #D #D #D
9 HARVARD PDP-10 D T D O D
10 LINCOLN LAB IBM-360/67 D D D D H
74 LINCOLN LAB TX2 D D D D D
11 STANFORD PDP-10 D D D D D
14 CARNAGIE PDP-10 D D O D D
where
D = Dead (Destination Host either dead or inaccessible [due to network
partitioning or local IMP failure] from the BBN Terminal IMP.)
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.)
NETWORK
ADDRESS SITE COMPUTER DAY, DATE AND TIME (EASTERN)
------- ---- -------- ----------------------------
M Tu W Th F
12/13 12/14 12/15 12/16 12/17
1300 1700 1700 1600 1400
1000 1400 1400 1300 1100
1 UCLA SIGMA-7 D #D D O O
*65 UCLA IBM-360/91 O #D D O O
2 SRI (NIC) PDP-10 D D D T O
66 SRI (AI) PDP-10 D D D D D
3 UCSB IBM-360/75 T O D O D
4 UTAH PDP-10 D D D D D
69 BBN PDP-10 T H H O T
6 MIT (Multics) H-645 O H O D D
70 MIT (DM) PDP-10 D O D O O
8 SDC IBM-360/67 #D #D #D #D #D
9 HARVARD PDP-10 O D O D T
10 LINCOLN LAB IBM-360/67 H D H H H
74 LINCOLN LAB TX2 D D D H D
11 STANFORD PDP-10 D D D D D
14 CARNAGIE PDP-10 D D D D D
*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 NETJRS. We are assuming that initial connection to the NETRJS
logger indicates that NETJRS is also functioning.
# These sites advertise that they may not have their systems available
at these times.
"STATUS OR
NETWORK PREDICTIONS"
ADDRESS SITE COMPUTER STATUS OR PREDICTION OBTAINED FROM
------- ---- -------- -------------------- -------------
1 UCLA SIGMA-7 Server Jon Postel
65 UCLA IBM-360/91 Remote Job Service
now, Telnet in April Bob Braden
2 SRI (NIC) PDP-10 Server John Melvin
66 SRI (AI) PDP-10 "Soon" Len Chaiten
3 UCSB IBM-360/75 Server Jim White
4 UTAH PDP-10 "Soon" Barry Wessler
*5 BBN (NCC) DDP-516 Never Alex McKenzie
69 BBN (TENEX) PDP-10 Server Dan Murphy
*133 BBN (TENEX-B) PDP-10 Server (Experimental) Dan Murphy
6 MIT (Multics) H-645 Server Mike Padlipsky
70 MIT (DM) PDP-10 Server Bob Bressler
*7 RAND IBM-360/65 User only Eric Harslem
*71 RAND PDP-10 January '72 Eric Harslem
8 SDC IBM-360/67 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 Winnet
74 LINCOLN TX2 "Soon" Tom Barkalow
11 STANFORD PDP-10 "Soon" Andy Moorer
*12 ILLINOIS PDP-11 User Only John Cravits
*13 CASE PDP-10 March '72 Charles Rose
14 CARNEGIE PDP-10 January '72 Hal VanZoeren
*15 AMES/(PAOLI) ILLIAC/
(B6500) September '62 John McConnel
*16 AMES IBM-360/67 Januray '72 Wayne Hathaway
*144 AMES TIP User only
*145 MITRE TIP User only
*19 NBS PDP-11 User only Robert Rosenthal
*147 NBS TIP User only
*158 BBN TIP
(Prototype) User only
*Host not included in daily testing.
[ This RFC was put into machine readable form for entry ]
[ into the online RFC archives by Daniel Lang 4/97]
AI ELI5
On this page
§1Status Report
RFC 287 is a status report from BBN dated December 22, 1971, covering December 6 to 18. The report notes that the BBN prototype Terminal IMP (Network Address 158) was unavailable for most of the previous two weeks due to hardware debugging, so there was no host status report for November 22 to December 6.
Several hosts are excluded from daily testing, falling into two categories: those not expected to function as servers for at least two weeks, and those intended as user-only hosts or supporting network operations only.
This is another report showing which computers worked that week. Some computers are skipped because they are not supposed to be servers or they are broken.
§2Excluded Hosts
Category 1: Hosts not expected to function as servers for at least two weeks
- BBN PDP-10 (B) at Network Address 133
- RAND PDP-10 at Network Address 71
- CASE PDP-10 at Network Address 13
- AMES ILLIAC and B6500 at Network Address 15
- AMES IBM-360/67 at Network Address 16
Category 2: User-only hosts and network operations hosts
This category includes Terminal IMPs (at AMES, MITRE, NBS, and BBN) used only for testing, the Network Control Center Computer (Network Address 5) used solely for statistics gathering, and specific user-only hosts such as the RAND IBM-360/65, HARVARD PDP-1, ILLINOIS PDP-11, and NBS PDP-11.
The NBS Terminal IMP (Network Address 147) was installed in Washington at the beginning of December.
Some computers were broken or not ready to test. Some were just for sending information out, not for receiving requests. This list shows which ones to skip.
§3Host Status Results
The report provides two weeks of daily test results across two pages, with status codes for each host each day. The codes are the same as in previous reports: D (dead), H (half-open), O (open), R (refused), and T (timed out).
A summary table shows each host's current status or predicted service status. For example, UCLA's SIGMA-7 is listed as a server, the UCLA IBM-360/91 offers Remote Job Service, SRI's PDP-10 is server status, MIT Multics is a server, and Stanford's PDP-10 is predicted to be a server soon.
The report shows if each computer was dead, open, timed out, refused, or half-open. Some hosts were supposed to become servers in the future.