Wireless bandwidth throttling

[J1mb08agg1n5]

Any particular reason why wireless devices may become severely bandwidth throttled, but not wired? Currently managing 25 Ruckus R510 11ac Wave 2 access points controlled by a ZoneDirector 1200 and randomly sometimes , internal connection speed on a wireless connection becomes severely degraded to about <1Mbps. I have carried out multiple iPerf tests on a wireless and wired connection to our main DC and with it being hardwired it's fine, but on wireless it's not. It's temperamental and intermittent. Tested on multiple devices and the issue seems to only pertain to wireless devices. For troubleshooting, I attached my laptop to an AP that connects into a Cisco SG350-28P as well as hardwiring in into the same port and again, connected wirelessly it's severely degraded but hardwired it's not. I even connected my laptop into the passthrough port on the R510 and it was fine. I can't explain it. My only thought is possibly the wireless system struggling with encryption and decryption so I was going to test this on an open network. My fall back option would to factory reset it and rebuild it from the ground up. I can't imagine it being a physical issue but maybe wrong. Just seems like it's being throttled massively somewhere or by something. There are no network policies or configurations in place that should be causing this. Any troubleshooting ideas, steps, testing I may be able to carry out to identify what on what might be causing this would be very much appreciated.

[RobD]

Is the client stationary when it degrades? My guess would be interference from something between you and the AP.

 

You could monitor the RSSI and the SNR with something like WinFi, when the signal drops does the SNR decrease? Ideally, you want to aim for a higher SNR. Above 20 dB is good SNR.

 

Yesterday in fact my friend had the same issue, his wife was walking through the house setting off his alarm motion detectors which in turn made his wifi unusable. He turned off the motion detecors and pollers and bobs your uncle.

 

Failing that I've seen Microwaves, strip lights and radar cause issues.

[jthompson]

Airtime fairness? Maybe lots of broadcast traffic being transmitted to wireless clients. IIRC they get transmitted at super conservative rates and so if there's a lot of it, it'll impact regular traffic. Not familiar with your WiFi gear at all, but perhaps look for options around blocking broadcast packets.