[ale] [OT] Strange wifi latency issues

[Ed Cashin]

Have you made sure there's no port on the 4-port NIC that is flapping
between link up and link down?


On Tue, Aug 23, 2016 at 8:43 AM, Ted W. <ted-lists at xy0.org> 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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-- 
  Ed Cashin <ecashin at noserose.net>
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