I have a campus of about 3 building. I have a total of 22 AP. A mixture of AP541N-A-K9 Dual Band Access Points and Enterasys RoamAbout AP1002 AP's. Almost dead even at 11 on each kind. I have been running 2.4 gtz wifi singnal for about 2 years now. I have a multi OS enviroment from Macs, PC's, iPhone's, iPads, and misc network devices. I run about 240+ workstations as well as a free wifi signal which gets about 600 - 800 connections each day. I run my DHCP lease time at 24 hours for this reason. Never had an major issues with this setup.
Here is where things get weird.
2 weeks ago Fri March 30th 2012 at around 5:00 pm my wifi goes down. I spent all night trying to get it back up and I couldn't figure it out. I went home to bed and was going to come in to work on it the next day. I get in and what do you know, the wifi is working fine. I check the logs and I can pull up is a ton of clients authenticating just fine to the wifi.
Yesterday BOOM!! the wifi goes down again. Same thing - so now I run some more "process of eliminations". Here is what I have discovered so far
Hardwired workstations not effected
Hardwired workstations connect and receive IP's just fine from DHCP server
No device can connect to 2.4 GHZ 802.11b/g/n
If I switch to 5 GHZ for Wifi, I can get supported devices to connect???????????????????
If I run a rouge detection I get nothing on my network, but there is a Non Broadcasting SSID full bars that my AP's are picking up
Here is the entry from my AP picking it up (Full Bars)
00:18:e7:d5:18:5b 100 AP (Non Broadcasting) On On 2.4 6 1 2393 Sun Jul 19 10:03:27 1970 1,2,5.5,11,6,9,12,18,24,36,48,54
I just dont get it, 2.4 nothing works. 5 it works. Am I have an interference issue? that would knock out 3 buildings within 3-4 acres? I need some ideas :)