March NSFNET T1 Usage by Service
jaw
jaw
Wed Apr 1 18:36:53 UTC 1992
Olivier,
The use of NNStat for statistics collection on the T1 backbone has
not been disabled at any point of entry. Ultimately, drastically
differing in and out counts are not unusual. On average, 27% of
the packets and 50% of the bytes are from ftp:
Jan 1992 28% packets 50% bytes
Feb 1992 27% packets 50% bytes
Mar 1992 29% packets 52% bytes
Using the net primarily for ftp will appear as a small amount of
traffic into the backbone and a significantly larger traffic
volume out.
Washington University at St. Louis (MO) exhibits a similar
statistical measurement:
Pkts (millions) Bytes (billions)
IN OUT IN OUT
Dec 1991 294 157 126 12
Jan 1992 332 212 139 17
Feb 1992 338 214 142 17
Perennially, they are the 1st or 2nd highest volume net on the NSFNET,
apparently due to a very large PC archive accessed primarily via ftp.
Similar numbers are noted with other high volume nets. It's not
surprising that other nets will show the reverse of this IN/OUT
volume relationship.
We hope this information helps explain your concerns. Please let
us know if we might provide further clarification.
With sincere apologies for the delay in sending
this information on to you, and thanks to Susan
Horvath for her analysis and review,
Jo Ann Ward
Merit/NSFNET Information Services
**********************************************************************************
Message: 12625724, 33 lines
Imported: 12:01pm EST, Wed Apr 1/92
Subject: Re: March NSFNET T1 Usage by Service
To: Merit/NSFNET Information Services-Interested Parties, Susan M. Horvath
From: MARTIN%CEARN.BITNET at pucc.Princeton.EDU
Merit/NSFNET.Information.Services-Interested.Parties at um.cc.umich.edu,
Douglas.E.Van.Houweling at um.cc.umich.edu,
nsfnet-reports at merit.edu,
nsfnet-info at merit.edu
cc: Elise Gerich <epg at merit.edu>,
Jessica Yu <JYY at MERIT.EDU>,
"Stefan Fassbender (GMD/EASInet)" <stf at easi.net>
In-Reply-To: Message of Wed, 1 Apr 92 10:49:34 EST from
<Susan.M.Horvath at um.cc.umich.edu>
Thank you for your very interesting tarffic reports, there is a question
which I have been trying to get answered without much success for some
time, which is the following:
Why is the traffic from ASN 590 (EASINet) into the T1 backbone so small
whereas the traffic to ASN 590 is so high (ratio 1/1000 in february).
(To be more precise: 78.736 Megabytes In, 82.14 Gigabytes Out)!
My personal explanation is that you only take into account the incoming
traffic and that for some reason, accounting has been disabled at the
EASINET entry into the T1 backbone, therefore only the traffic coming via
alternate access points (i.e. secondary or ternary) is really accounted for,
however, I could never get any confirmation of this "theory".
If this theory happened to be right, I would very much appreciate that
adequate mention to it be made inside the files containing the traffic
statistics.
Olivier
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