On Wed, 21 Jan 2015, Richard Smith wrote:
On 01/20/2015 11:59 AM, Rich Brown wrote:
One of the first things I would do is a Wifi site survey, to look for
conflicts between access points/channels, etc. Two recommendations
for tools:
MacOSX: WiFi Explorer from Adrian Granados - US$4.99 from the Mac App
Store. http://www.adriangranados.com/apps/wifi-explorer Android: WiFi
Analyzer from farproc - Donationware from the Android store.
https://sites.google.com/site/farproc/wifi-analyzer
Thanks for the suggestion. I've done that.
I'll offer up a 3rd choice which I have been using. Horst.
Runs on OpenWrt perfectly and free. I've not tried it on CeroWrt yet but I
don't see why it would not work.
http://br1.einfach.org/tech/horst/
With horst I've verified that the 3 AP's we are running are all on 5Ghz
channels that don't have another AP on them. We are up on the 10th floor of
a tower type building and 3 of our walls have large windows with clear views
of surrounding buildings. We are higher than most of the stuff around us.
Ok, this would suggest that you are unlikely to have interference causing your
problems. I don't have the earlier part of this thread still in my mailbox, what
is the problem that you are trying to solve again?
When you do a wifi survey, you are not just looking at one spot, or near the APs
for what you see. You should also be going to all the areas your users are going
to be trying to access your network and see if you have a strong enough signal
from at least one AP everywhere. Also note that if you have high-power APs, you
may hear a signal from them, but they may not be able to hear the signal from
the mobile device very well. Mobile devices tend to have lousy antennas, and try
to operate a lower power levels to save battery power. So you may need to look
at the stats on the AP showing the signal it sees from the client.
Assuming that you have enough signal, the next question is how many people are
going to be trying to use the network at one time. You may be better off with
more APs operating at lower power levels so that you have fewer people talking
to each one.
David Lang
So when I scan I do see a lot of intermittent probes or wifi traffic
from other things but nothing cronic. I haven't been able to run a scan when
it all goes to hell though.
With horst it shows me the DATA or QDATA packet among the radiotap info and
that the contents are encrypted but I've not figured out how to capture
decrypted traffic at the same time as radiotap info. This would let me see
exactly what sort of dynamic was happening from our network.
As an aside if any of the gurus here are near the Boston, MA area and
want to do small business Wi-Fi consulting let me know. We will gladly
pay someone to fix our wireless.
--
Richard A. Smith
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