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EAP245 Lag spikes and packet loss

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EAP245 Lag spikes and packet loss

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EAP245 Lag spikes and packet loss
EAP245 Lag spikes and packet loss
2020-08-24 18:04:51 - last edited 2020-08-24 19:13:46
Model: EAP245  
Hardware Version: V3
Firmware Version: 2.4.0 Build 20200117 Rel. 39932

Hi!

 

I have 2 EAP245 connected to a router which also works as DHCP. All is managed by a Windows PC running Omada Controller and connected directly to the router.

 

The first AP is in the rooms part of the house. There are around 11 to 15 devices connected to it. Mostly laptops, smartphones and tablets and a smart TV.

 

The second AP is on the living room part of the house. There are 2 to 4 devices connected to it. A console, a printer and sometimes a laptop or smartphone.

 

Regardless of the distance between the devices and the AP I am having several lag spikes every 5 to 10 seconds and can range from 200 up to even 20000ms.

 

Here's a graph of the lag spikes pinging to google.com from a MacBook Pro.

 

Here are the ping results from a MacBook Pro to: 192.168.100.115 (the rooms AP), 192.168.100.1 (the Router) and 192.168.100.116 (the living room AP). Notice how the 2 lag spikes are separated by 10 seconds.

 

 

 

Sometimes the packets get stuck and suddenly appear all in one go with a massive latency time.

 

I have already tested the connectivity between the APs and the router and it is fine. pinging from the router or the PC to the APs doesn't show any lag spike so it must be an issue with the WiFi part of the network. 

 

Any suggestions? 

 

Thanks!!

 

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#1
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19 Reply
Re:EAP245 Lag spikes and packet loss
2020-08-24 19:30:50 - last edited 2020-08-24 19:40:05

@EPerezF, WiFi is a half-duplex shared medium. Half-duplex means high latency due to change of directions when transferring data, shared means even higher latency when not enough AirTime is available, e.g. due to interferences of nearby APs in your neighborship.

 

Nothing unusual so far.

 

If your goal is to get best latency, clean up the wireless environment. Connect every stationary device (smart TV) by cable, not wirelessly. Use 20 MHz channel width even for 5 GHz, fixed channels, do a survey to find best channels. Throughput will be ¼ of max. theoretical thorughput.

 

If your goal is to get best throughput, use 80 MHz channel width for 5 GHz, ac-only mode if possible, fixed, non-overlapping channels (you need 16 (!) 5 GHz channels at once for 80 MHz). Latency will be high when available AirTime is low for whatever reason.

 

Maybe WiFi-6 will give a better latency, but it will need years until all client devices fully support WiFi-6. And I guess WiFi-6 APs will be much more expensive than WiFi-5 APs.

 

If you want a guaranteed latency < 1ms over the air, you need to use other (proprietary) techniques beyond 802.11 WiFi with at least two simultaneous wireless links, one for sending, one for receiving data, thus implementing a full-duplex transmission. Such devices exist, but they are very expensive.


 

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#2
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Re:EAP245 Lag spikes and packet loss
2021-01-12 15:51:17

@EPerezF 

I just want to reply here and say that I have the exact same issue. I'm working from home, here alone during the day, and there's nothing else competing for bandwidth. My office is right on top of the access point. Whether I'm using 2.4ghz or 5ghz, access point 1 or 2 (I'm using the omada controller), my work macs (I had the first one replaced) both have consistent lag/latency every 30 seconds - 1 minute. If I bring up my dell xps and place it next to the mac, and run the same ping test, I get amazing consistency.

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#3
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Re:EAP245 Lag spikes and packet loss
2021-10-31 01:15:02 - last edited 2021-10-31 01:15:45

Chiming in to say I also have this same issue, and so do people here:

https://community.tp-link.com/en/business/forum/topic/167024
https://community.tp-link.com/en/business/forum/topic/191718

I have this isue on both my EAP 245 and EAP 110 Outdoor. It seems specific to MacBooks. But I have the exact same issue, several of our macbooks will get unusable wild pings, even if they are the only client connected to an AP and have great signal. Other laptops and even phones connected from the exact same place will be rock solid. I've tried disabling airtime fairness, splitting my 5g and 2.4g into different SSIDs, disabling minimum RSSI, basically disabling everything you can possibly disable that might be causing issues, but nothing has helped. There seems to be no recognition from TP-Link that there is some incompatability between their hardware and certain MacBooks and they just say "have you tried basic troubleshooting".

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#7
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Re:EAP245 Lag spikes and packet loss
2021-11-08 16:34:08

@Philbert This is the thread I was mentioning w/ a better description of the problems between older macbooks and Omada EAP.

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#8
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Re:EAP245 Lag spikes and packet loss
2021-11-13 17:14:51

Hey this is an issue affecting multiple users, could we at least get a response from TP Link? I'm willing to work with yall to try and debug it but I have no idea where to start.

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#9
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Re:EAP245 Lag spikes and packet loss
2021-11-20 17:46:40 - last edited 2021-11-20 17:49:16

Nothing? At all?

https://www.reddit.com/r/TPLink_Omada/comments/qv11bb/eap245v3_with_firmware_504_appears_to_be_causing/ seems like it might be related. Gonna try downgrading and see if it helps.

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#10
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Re:EAP245 Lag spikes and packet loss
2021-11-23 18:44:14
So downgrading to 5.0.0 does help but is obviously not an ideal solution.
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#11
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Re:EAP245 Lag spikes and packet loss
2021-11-23 18:44:19
So downgrading to 5.0.0 does help but is obviously not an ideal solution.
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#12
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Re:EAP245 Lag spikes and packet loss
2021-12-21 02:13:49 - last edited 2021-12-21 02:16:41

Hey Tp-Link here's another! https://www.reddit.com/r/TPLink_Omada/comments/rl177w/is_anyone_else_experiencing_random_dropouts_all/ any chance of getting at least an official reply on this? Like, you're looking into it or something? I've also emailed support and no reply....

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#13
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Re:EAP245 Lag spikes and packet loss
2021-12-30 05:36:20

Anything? Anything at all? Its enough to make me sell my Omada gear and go back to Ubiquiti.

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#14
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