SURVEY is in operation again
The SURVEY host-checking program at MIT-DMCG is running again, now every 20 minutes.
Bhushan, A.K., "SURVEY is in operation again", RFC 523, DOI 10.17487/RFC0523, June 1973, <https://www.rfc-editor.org/info/rfc523>.
@misc{rfc523,
series = {Request for Comments},
number = 523,
howpublished = {RFC 523},
publisher = {RFC Editor},
doi = {10.17487/RFC0523},
url = {https://www.rfc-editor.org/info/rfc523},
author = {A.K. Bhushan},
title = {{SURVEY is in operation again}},
pagetotal = 2,
year = 1973,
month = jun,
} RFC text
Network Working Group Abhay K. Bhushan
RFC # 523 MIT-DMCG
NIC # 17048 June 5, 1973
SURVEY is in Operation Again
The purpose of this message is to inform the network community that the
survey program at MIT-DMCG computer system is in operation now. We are
surveying hosts every 20 minutes instead of the earlier 15 minutes. It
appears that some sites had problems with incomplete ICP's when survey
first came up. The problem has definitely been fixed now. Please let
me know (tel 617-253-1428 or 253-1449) if any site is being
inconvenienced by the survey program. Upon written request I will be
willing to not survey a particular server site. Upon oral or written
request, I will add sites who wish to be surveyed but are not surveyed.
The sites currently being surveyed are (host number in decimal):
1,2,3,4,6,7,8,9,10,11,13,14,15,16,23,31,32,35,65,66,69,70,74,78,86,133,
134,138,198. We issue an RFC to socket1 and now go though the complete
ICP, ie establish telnet connections and then close them. The time for
response is now the time to establish the telnet connections, so if your
response time shows a larger number don't be alarmed (I think the new
numbers are more meaningful and reflect the situation more accurately.)
We are also providing a NETSTATUS service on socket 15. (decimal). So
if you ICP to host 70 socket 15., you will get the following output:
mm,dd.yyyy,hh,mm
nnn,c,ttt
nnn,c,ttt
.......
-1
Where first item is month, day, year, hour, minute and then is a list of
host numbers, code, response time in tenths of second. The list ends
with a minus 1, and we close the connections right after sending data
(The service is designed so that both human users and programs can use
the data ). You can of course log into dmcg and use our NETWRK
subsystem which has commands for displaying the survey data in many
formats (Ref. RFC 308, NIC 9259). We are also recording this data on
the DATACOMPUTER (CCA). Your comments and suggestions will be
appreciated.
Thank You
Abhay Bhushan
AKB@DMCG (NIC ident AKB)
[ This RFC was put into machine readable form for entry ]
[ into the online RFC archives by Alex McKenzie with ]
[ support from GTE, formerly BBN Corp. 10/99 ]
AI ELI5
On this page
§1SURVEY Is Back
Abhay Bhushan announces that the survey program at the MIT-DMCG computer system is in operation. Hosts are now surveyed every 20 minutes instead of the earlier 15 minutes.
Some sites had problems with incomplete ICPs when survey first came up. The author says the problem has been fixed, and asks to be told if any site is being inconvenienced. On written request he will not survey a particular server site, and on oral or written request he will add sites that want to be surveyed.
The checking program is running again. If it bothers you, ask the owner to stop knocking on your door.
§2How the Survey Works
Survey issues an RFC to socket 1 and now goes through the complete ICP, which establishes Telnet connections and then closes them. The response time is therefore the time to establish the Telnet connections, so larger numbers than before are expected and, the author thinks, more accurate.
The sites then surveyed were hosts 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 23, 31, 32, 35, 65, 66, 69, 70, 74, 78, 86, 133, 134, 138 and 198, numbered in decimal.
The program does not just ring the doorbell, it walks all the way in and says hello, so it takes a little longer.
§3The NETSTATUS Service
A NETSTATUS service is provided on socket 15 (decimal) of host 70. An ICP to it returns a header line with month, day, year, hour and minute, then lines of host number, code and response time in tenths of a second. The list ends with -1, and the connection is closed right after the data is sent.
The output is designed for both people and programs. Users can also log in to DMCG and use the NETWRK subsystem to display the data in many formats (see RFC 308). The data is also recorded on the DATACOMPUTER (CCA).
You can also ask the program for a list, one line per computer, saying how fast each one answered.
mm,dd.yyyy,hh,mm
nnn,c,ttt
nnn,c,ttt
.......
-1