From: E. Bond Francisco (ebondf@uclink.berkeley.edu)
Date: Tue Jul 22 2003 - 14:19:10 PDT
Michael,
I can't tell you how much I appreciate your investigative prowess, your
succinct style of communication, and the fun that you seem to have with it!
By the way, the reason I don't come to work on weekends is because I have a
MAC at home . . . :<>}
Thanks,
Bond
>-----Original Message-----
>From: owner-magnet-list@uclink4.berkeley.edu
>[mailto:owner-magnet-list@uclink4.berkeley.edu] On Behalf Of
>Michael Sinatra
>Sent: Tuesday, July 22, 2003 12:13 PM
>To: Greg Merritt
>Cc: magnet-list@uclink.berkeley.edu
>Subject: Re: [MAGNet] administrative staff using Macs?
>
>
>
>
>On Mon, 21 Jul 2003, Greg Merritt wrote:
>
>>
>> Our administrative office staff (accounting, payroll,
>personnel,
>> grants, etc.) here at the Institute of Transportation Studies use
>> mostly Macs. What other departments/groups on campus are
>> predominantly Macintosh for administrative functions?
>
>This discussion reminded me of something Tom H. asked me to do
>a long while back, which is to provide a *rough* estimate of
>the number of Apple/Mac devices on campus using CNS's ARP
>cache data. So here's what I
>did:
>
>CNS maintains "snapshots" of each day's ARP data over the past
>six months. I looked at
><http://standards.ieee.org/regauth/oui/index.shtml> and found
>all of the registered MAC address prefixes that belong to
>Apple Computer. I then chose some representative days and
>searched for the set of Apple MAC (pardon the pun) addresses
>for each day. I removed duplicates and compared the resulting
>number to the days full data (again with duplicates removed).
>Duplicates would be caused by one machine changing networks/IP
>addresses during the day, changing airbears networks or
>getting a new dhcp address durning the day, etc. I then
>computed the percentage of Apple MAC addresses to the total.
>This would represent the percentage Apple/Mac devices powered
>on and connected to the network at any time of the day.
>
>I picked some representative days and here's what I found
>(each day is measured roughly from midnight to midnight):
>
>Monday, July 21, 2003: 3283 Apple, 20423 total (16.1%)
>Saturday, July 19, 2003: 1811 Apple, 14241 total (12.7%)
>Thursday, June 5, 2003: 3404 Apple, 20107 total (16.9%)
>Tuesday, April 15, 2003: 4227 Apple, 27077 total (15.6%)
>Tuesday, April 30, 2003: 4212 Apple, 27226 total (15.5%)
>Monday, March 17, 2003: 4127 Apple, 26615 total (15.5%)
>Saturday, February 8, 2003: 2338 Apple, 19351 total (12.1%)
>Thursday, Jan 23, 2003: 4128 Apple, 26444 total (15.6%)
>Thursday, Dec 19, 2002: 3445 Apple, 22457 total (15.3%)
>Wednesday, Oct 30, 2002: 4100 Apple, 26593 total (15.4%)
>
>CAVEATS:
>
>1. We do not poll ARP data for the entire campus.
>Specifically, the modems, EECS, University Extension, Space
>Sciences Lab, University Health Services, and UC Printing are
>not polled, for a variety of technical reasons. Also any host
>that is behind some sort of NAT box or non-briding firewall
>will NOT show up in the ARP cache. The survey DOES include
>the Res Halls.
>
>2. Many network devices show up in the ARP cache and some have
>multiple MAC addresses that may or may not show up in the
>cache. CNS has roughly 1500 manageable network devices on
>campus. These MAC address do not represent actual USER HOSTS,
>so the percentage of Apple/Mac devices compared to actual user
>hosts may actually be higher.
>
>3. Some Apple/Mac devices may be using third-party networking
>devices, which would NOT show up in this survey as an
>Apple/Mac device. It's also possible that some Apple-branded
>devices *may* use third-party chipsets, which may or may not
>show up as an Apple MAC address. This may imply that the
>number of Apple devices is higher than the percentages show,
>but it's not completely unknown what effect this has, if any.
>
>4. This survey also includes network-attached printers and
>other devices. It's possible that an all-mac shop uses an HP
>network printer or that an all-PC shop uses an Apple network
>printer, but I have no idea how this might skew the overall
>results, or if anyone cares.
>
>END OF CAVEATS
>
>The results look pretty consistent, with an obvious drop-off
>on weekends of the total number of connected hosts. (It's
>nice to see that some people turn their computers off over the
>weekend, thereby saving the University money and making it
>(slightly?) less likely that we'll be taking pay cuts soon.)
>Interestingly, the Macintosh percentage drops on the weekend
>also. I draw the following possible conclusions from this,
>with varying credibility:
>
>1. A higher percentage of Apple/Mac computers are used for
>administrative applications; hence, the higher weekday percentage.
>
>2. Apple/Mac users are more environmentally and pay-cut
>conscious than their Windows and (especially) Unix bretheren
>and sisteren. They are therefore more likely to turn off
>their computers or put them into power-saving mode on weekends.
>
>3. Apple/Mac users are more possessive of their weekend
>leisure time and are less likely to come to work on weekends.
>(I am sure some Mac fans will say that they don't *have* to
>come to work on weekends because they're so productive on their Macs.)
>
>You can draw your own conclusions, too.
>
>michael
>
>
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