SURVEY is in operation again
MIT-DMCG announces that its host survey is running again and describes the NETSTATUS service.
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)
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ISO Plain Language
On this page
§1SURVEY Resumes
Abhay Bhushan announces that the survey program at MIT-DMCG is operating again. It now surveys hosts every 20 minutes instead of every 15 minutes.
Some sites had problems with incomplete ICPs when the program first started. Bhushan says the problem has been fixed. A site can ask in writing not to be surveyed, or ask orally or in writing to be added.
The host survey is running again and checks less often than before. A site can ask to be included or left out.
§2How the Host Check Works
The program issues an RFC to socket 1 and now completes the full Initial Connection Protocol (ICP), including establishing and closing Telnet connections. Response time measures the time needed to establish those connections. Bhushan says this can produce larger numbers than the earlier method, but that the measurements are more meaningful.
The surveyed decimal host numbers are 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.
The check completes a Telnet connection instead of stopping at an earlier step. The reported response time measures how long that connection takes to start.
§3Getting Results from NETSTATUS
The NETSTATUS service runs on decimal socket 15 of host 70. An ICP to that socket returns a date and time, followed by lines containing a host number, a code, and a response time in tenths of a second. The list ends with -1, and the connection closes after the data is sent.
The output is designed for people and programs. Users can also view the survey data through DMCG's NETWRK subsystem, and the data is recorded on the DATACOMPUTER (CCA). The RFC refers readers to RFC 308.
NETSTATUS returns a dated list of hosts and their response times. A special end marker tells a program when the list is complete.
mm,dd.yyyy,hh,mm
nnn,c,ttt
nnn,c,ttt
.......
-1