[ale] [OT] Strange wifi latency issues

[James Taylor]

You might also check the channel you're AP is running on, and verify you're not seeing a lot of other AP's in the area running on that same channel.
Could be interference from other devices within range.
Switching the channel is an easy test.
-jt
  
 

James Taylor
678-697-9420
james.taylor at eastcobbgroup.com



>>> DJ-Pfulio <djpfulio at jdpfu.com> 8/23/2016 8:58 AM >>> 
Test between every piece of equipment.

* router to ISP
* router to wired system
* wifi to router

Try different wifi connections ... don't just trust the results of 1 wifi card
in a single laptop.  Use all the smartphones, rokus, r-pis in the house too.

Reduce the range involved. No walls. Line of sight and 15 ft is good.

Until you nail down where the issue lies, we just don't know where to begin.

If it is with the ubiquity stuff - RMA it and get a replacement. This is not
normal. If the wifi equipment still shows latency, try moving closer.  Then look
for interference.  All sorts of things cause interference. Turn those off. Get
your neighbors to turn theirs off for your testing.  Look at all the wifi stuff
in use nearby. Did you pick a clear channel that doesn't overlap others?

If you'd like more help - come out almost any Sunday to the ALE meetup and we
can discuss wifi extensively (probably more than you'd like). I have lots of
experience with it.

On 08/23/2016 08:43 AM, Ted W. wrote:
> I recently upgraded my network from a WRT54G running OpenWRT to an X86
> PC with a 4 port GbE NIC running PFSense and a Ubiquiti AC Lite AP.  Since
> the upgrade I have been experiencing intermittent latency spikes peaking
> between 5000ms and 10000ms lasting for anywhere between 3 and 5 minutes.
> There seems to be no regular interval that I can determine as my wife has
> reported these issues during the day and I've experienced them firsthand
> when I get home from work.  Some days I will see several in the course of
> an hour or two and other times we'll go days without seeing it a single
> time.
> 
> I was curious if anyone here has seen similar behavior before and might
> be able to provide some clues as the it's source.  Originally I thought
> that this issue was related to my ISP but a ping test against my local
> gateway shows that it persists when communicating with devices on the
> same local network.  The last set of tests I ran to determine that the
> latency existed on the local network was done while connected to the
> wireless.  By the time I finished testing from the wireless last time and
> got down the basement to try while plugged directly in to the PFSense
> box the latency has subsided.  It has not re-appeared since (about a week
> now).
> 
> Aside from confirming whether the latency persists on the wired network,
> what other steps should I take?  Are there any settings on either the
> PFSense box or the Ubiquiti AP that could cause this?  Perhaps some
> confirmation conflict between the two devices that I'm not seeing?  One
> thing I should probably also mention is that this issue persists across
> devices.  We usually notice the latency spike occur while watching
> Netflix on the living room TV (a Samsung "smart" TV) and I can confirm
> the latency on both my personal and work laptops as well as my phone.
> All of these devices are connected to the same SSID.  I have not tested
> it from the guest SSID.
> 
> Thanks in advance for any information or advice.  This issue has been a
> real pain in the arse.  Finding a solution here would make for a happy
> household once again. 
> 
> -Ted



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