wifi connection drops

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We use Enterasys 3605 APs in our classrooms. Radio 1 is a/n on 5.0GHz and Radio 2 is g/n on 2.4 GHz. Our 3 SSIDs (wlan, wpa, n) are on both radios. Our users have iPads and Mac air laptops. Users report their wifi connection being dropped. A user will be connected to the wifi in one room ,and then when they go to a different room; their connection drops.
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Laura

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Posted 3 years ago

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Sean Hogston, Extreme Alumnus

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Have you done any kind of survey to make sure there is a good enough signal along the path they are walking to keep a connection and perform a proper roam?
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Laura

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No, I don't think this school district has money for surveys. Do you know of any free tools to check AP converage or conflicts?  We pretty much have an AP in every classroom, bu the walls are thick concrete. An apple tech says we should turn off the g/n radio on every other AP.
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Thomas Randolph

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Do you have Auto Tx Power Ctrl (ATPC) enabled and configured on your APs?

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Sean Hogston, Extreme Alumnus

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Ekahau has a free tool called Heatmapper. Designed for homes so it's limited on how many APs can be placed on a map.
Then Inssidr from meta geek will give a good visual of signal levels as you walk around but dosnt do maping. There is a good tool on the Mac now called NetSpot. It's pretty inexpensive so that may be an option and it does heatmaping as well.
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Laura

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Thanks, I have netspot, but don't have time to go take measurements, unfortunately.
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Ronald Dvorak, Embassador

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Could you check the controller report "active APs" to look for the channel / tx power used on the affected AP.
Do you see any client connected to this AP in the "clients by AP" report.
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Laura

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All the APs are up and running. And There are clients attached.
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Laura

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we don't have Auto Tx Power Ctrl (ATPC) enabled . what does that option do?
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Ronald Dvorak, Embassador

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ATPC = the APs "talk" to each other and APs on the same channel that could hear each other will reduce the tx power to minimize channel interference.
I leave it normally off, there are enough available channels in the 5GHz band.


Any special reason why you don't upgrade to a more recent version - 8.32.2 was released December 2013.
Extreme included many 36xx series software fixes in the meantime.

Is your controller licensed for NA or ROW and what country is the AP set to.
I wonder because the current tx power of 14dBm on radio#1 seems a little bit low to me.

Is it your intention to have only 20MHz channel on radio#1 instead of 40MHz.
You'd double the connection speed with it to 300Mb instead of 150Mb.

Just as I'm curious.... could you share why the controller is only connected with one/the 1GB interface to the LAN.
Not a big issue if you bridge@AP all traffic (I think that is your setup as far as I'd remeber from your other post).
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Thomas Randolph

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I would suggest running an AP Client report to verify what protocol your clients are using. Under Reports --> Clients --> All Active Clients.
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Laura

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I don't know why we don't upgrade. I will ask the TIS director if he wants to. I don't know what NA or ROW is. I think our APs set to the U.S. I did notice that one school's APs have 20MHz on radio 1 and 2, but all the other schools have 40Mhz on R1 and 20 on R2. Maybe whoever set it up forgot to change that.  And i don't know why we are connected to just 1GB int on LAN. IS that good or bad? a setting i found says "bridged at AP", don't know what that means either.
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Ronald Dvorak, Embassador

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I think it's a good idea to upgrade to a v9.15 version to make sure you get GTAC support if you run into a bigger problem and need to open a ticket,

NA/ROW - is the region to which the controller is licensed for, my controller here in Austria has a ROW (rest of world) license so i.e. channel 1-13 is supported and the APs don't tx power more then the regulatory domain allows.
As you've mentioned your AP is set to US which would mean you've a NA license installed.

bridge@AP - is one topology mode of the controller - in that mode traffic from the wirless client is send to the AP and the AP is forwarding the traffic directly to the LAN port, either untagged or tagged into another VLAN.
So the client traffic never passes the WLAN controller i.e. if you've one controller in the HQ and many branch offices. The traffic stay local in the branch and is not forwarded via the AP to controller tunnel to the HQ.

If all your SSIDs use bridge@AP mode I see no problem to connect the controller with only the 1Gb port.
On the other hand if you use also other topology modes like routed or bridge@EWC were the traffic is passing thru the controller I'd use one of the two 10Gb ports of the controller to connect it to the LAN so you'd don't have a bottleneck on the controller site.
Or even better use both 10Gb ports in a LAG (link aggrigation) configuration for a logical connection of 20Gb.