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IP: more on WiFi experiences
From: Dave Farber <dave () farber net>
Date: Fri, 17 May 2002 11:41:25 -0400
Date: Fri, 17 May 2002 08:06:41 -0700 From: Joel M Snyder <Joel.Snyder () Opus1 COM> Subject: Re: IP: Is Wi-Fi Getting Too Crowded? To: farber () cis upenn edu This is a cryptographically signed message in MIME format. --------------ms0B3F97A28D79780B554932D7 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit
Is Wi-Fi Getting Too Crowded? By Ed Sutherland <http://www.80211-planet.com/columns/article/0,4000,1781_1122641,00.html>
Our experience at Networld+Interop last week seems to demonstrate otherwise. I participated in a group (the Interop iLabs) working on a wireless security demonstration (802.1X, IPSEC, all that jazz). As part of that, we had 10 access points, 802.11b, all within 4 feet of each other. We had no problems at that density. When we moved from hot stage to show floor, the density was incredible. I used a new AirMagnet ( http://www.airmagnet.com/ the new tool of choice for 802.11b troubleshooting) and was able to "see" over 60 access points and over 180 stations without moving an inch. This is without any high-gain antenna, mind you. Walking the distance between our booth and classes we were giving, a corridor perhaps 100 yards long, brought the station count up to over 300. Yes, at that density, there were issues: beacons at 100 ms are probably too closely spaced together. We also saw anecdotal evidence of cards associating to the wrong access point, possibly because of an overflow in the stack where SSIDs are stored. But people were also happily using wireless and no one was complaining about thruput. But I regard that show floor as an amazing validation of the whole concept of spread spectrum. If you can get 802.11b to operate on the Interop show floor, then I'm not horribly worried about it "in the wild." jms Possibly relevant URL: iLabs wireless security http://www.ilabs.interop.net/details?topic=WLAN_Sec -- Joel M Snyder, 1404 East Lind Road, Tucson, AZ, 85719 Phone: +1 520 324 0494 (voice) +1 520 324 0495 (FAX) jms () Opus1 COM http://www.opus1.com/jms Opus One For archives see: http://www.interesting-people.org/archives/interesting-people/
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