Macbook WiFi connection issues

I have about 20 students at my school using MacbookAir computers.  I am having difficulty keeping them connected to my WiFi network.  They continue to bounce around, trying other WiFi connections.  Some of the SSIDs that they are trying to connect to are no longer valid but the Mac continues to look for them.  As a result my users are continually getting disconnected.

My access point is an Engenius EWS360AP.  One person suggested turning off the 2g radio and only letting them connect to the 5g.  I have been adjusting the WiFi connection on each computer to put the desired SSID at the top of the list and then telling it to ask before joining any other network.  This seems to help but it is only a stop-gap measure.

Any thoughts?
Ken HerrIT DirectorAsked:
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strungCommented:
You could try deleting all the networks but yours from the Mac's network prefs, then uncheck "remember networks"

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Ken HerrIT DirectorAuthor Commented:
Thank you strung.  Yes, that is what I am doing and it works for now but I was looking for a solution that involves less from the user.  Teenage kids will find a way around our settings  :-)
strungCommented:
Do they have admin privileges on the Airs?
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serialbandCommented:
You should still turn off the 2.4 GHz radio.  That spectrum's polluted and it's the same frequency as a microwave oven.

And rather than just deleting the Wifi Networks, you should just set a location and just add the school Wifi to it.  Don't use Automatic.
Ken HerrIT DirectorAuthor Commented:
No solution yet.  I am trying another brand of WAP.
Ken HerrIT DirectorAuthor Commented:
As I explore the problem further with my users, I think the wireless disconnection is a red herring.  I think the web content is being interrupted by my content filtering.  I use OpenDNS on my 2012 server and native filtering on my Sonicwall.  I am suspecting a some sort of conflict between OpenDNS and my firewall filter but don't know how to test.

I have found that if I remove OpenDNS addresses from my server the disconnection issues go away.
strungCommented:
You could try switching to Google DSN 8.8.8.8 and 8.8.4.4 unless you have a pressing need for OpenDNS.
serialbandCommented:
There are numerous other DNS out there.  Google is not the only one.  Google is oversubscribed.

4.2.2.1
4.2.2.2
4.2.2.3
4.2.2.4
4.2.2.5
4.2.2.6

http://www.tech-faq.com/public-dns-servers.html
Ken HerrIT DirectorAuthor Commented:
None of these answers were really helpful.  Nobody seemed to be able to give a clue and the responses got off-track.
Ken HerrIT DirectorAuthor Commented:
Nobody really addressed the issue and the thread got off track.
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