Julian,

That's not a problem we've run into yet <insert sound of knocking on wood>.  In 
fact we've seen the opposite from time to time with clients in some of our 
older b/g only infrastructure buildings preferring the 802.11a from the 
building next door.

If you guys are an Aruba house and running 3.3.2.5 there's some new features 
within that may help.  Specifically bandsteering.  The Aruba folks were just up 
here for a demo/proof of concept of this and it worked really well.  
Unfortunately I need to get my infrastructure to 3.3 before I can take 
advantage of it.  But it may be what you are looking for.  The Farpoint group's 
whitepaper gives a good overview of these features and can be found here:

http://www.arubanetworks.com/pdf/technology/whitepapers/wp_arm.pdf

Good Luck!

___________________________________
Jim Galiardi
Network Specialist, Network Systems
UW Technology
University of Washington
(206)616-0397
Box 354150


-----Original Message-----
From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[EMAIL 
PROTECTED] On Behalf Of Julian Y. Koh
Sent: Monday, October 06, 2008 6:50 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: Macs prefer b/g over a?

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

At 09:35 -0400 10/6/2008, Philippe Hanset wrote:
>Has anyone found a way to force Macs to prefer
>802.11a over 802.11b/g?
>
>We provide in places with high wireless demand 802.11a in addition
>to 802.11b/g, but Macs never seem to join 802.11a (except in a few random
>cases)

We've been working on similar issues with Aruba, and they claim that there
is a known issue with Mac OS X clients in terms of frequency band
selection.  Supposedly according to Apple, clients with Mac OS X 10.5.3 and
higher should prefer the 5GHz band over the 2.4GHz band.  But there are
still a bunch of other things going on that we're working on
characterizing.

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--
Julian Y. Koh                         <mailto:[EMAIL PROTECTED]>
Network Engineer                                   <phone:847-467-5780>
Telecommunications and Network Services         Northwestern University
PGP Public Key:<http://bt.ittns.northwestern.edu/julian/pgppubkey.html>

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