High latency every 15 minutes to RT-AC66U

[jpdsc]

Good morning, afternoon, evening,

Lately every PC and laptop in my house is having high latency to the RT-AC66U. This only happens once every 15 minutes for a spit second and causes only games to lag and sometimes even disconnected completely.

I have been monitoring TOP command in the terminal but no spike in CPU/MEM usage around the time the high latency happens.

Below is an example of a wired PC direct connected to RT-AC66U

Does anyone know how to troubleshoot this?

Thanks in advance.

 

[Vexira]

is the router ever power cycled, or is it always on like mine. and which firmware version.

 

[jpdsc]

is the router ever power cycled, or is it always on like mine. and which firmware version.

Hi Vexira,

I rebooted the router yesterday and it still showed the 15min latency.
Currently; the router has Firmware:380.66_2 installed. Also, no scripts are running with a 15 minute interval. I have one which checks the ACCEPT log for external WOL but this is every 5 seconds.

 

[Vexira]

have you tired an isolation test by removing all devices attached or on wifi, and removed the scripts and re installed them one by one to check in case one of them is the cause.
Also try upgrading to 380.66_4 and see if it helps.

 

[jpdsc]

have you tired an isolation test by removing all devices attached or on wifi, and removed the scripts and re installed them one by one to check in case one of them is the cause.

Not yet, going to do that today. I disabled Radio for 2.4 and 5ghz now. Only 1 wired PC is connected.
Running the trace again and see if it still occurs.

 

[jpdsc]

Apparently it is something in the router which makes the CPU spike:

When this happens, all clients have a very high latency. I am going to try and capture these with TOP command but yesterday it didn't give me anything...

Edit:

- Unmounted USB drive
- Stopped ab-solution
- Disabled Radio for 2.4 and 5 ghz
- No user scripts are running atm
- Updated router to latest firmware

 

[Vexira]

have you tired a factory reset?

 

[jpdsc]

have you tired a factory reset?

No, not yet... I have 8+ port FWD to my server :'( which I will have to re-do. So a fact. reset would be the last possible solution (which is coming close).

@Vexira, which router do you have?

 

[Vexira]

I'd try the firmware upgrade first before a reset. I have the RT-AC88U I haven't noticed any lag spikes but then again I'm running adaptive qos and Ai protection on a newer model, also I do want to know what type of internet connection do you have, dsl cable or fiber. Is spanning tree protocol enabled or disabled. I do have a friend who has a 66u I can ask him if he gets spikes. As much as I'm tempted to recommend buying an 88u, I'd leave that as an ultimate last resort scenario as in if it's not fixable via a reset. Also make sure that nothing on the pc is flooding traffic.

 

[jpdsc]

@Vexira, thanks. I have updated the firmware and the spikes still happen every 10 minutes sometimes higher ms than others.

My internet connection is Cable > 150mbit DOWN and 15mbit UP.
The high latency happens on all available PCs/Laptops and it shows activity on router side when this happens.

Where can I find out if spanning tree protocol is enabled or disabled? I can't seem to find it in the webgui.

I did find something weird in syslog. The moment the latency is high I see 100+ ACCEPTED connections on the same second. Meaning, something is probably flooding it.
The SRC IP is my server where I am running PingPlotter... I now switched of the server and am checking from my game PC and syslog on the webgui

 

[Makaveli]

Have you tried turning off AI cloud?

 

[Vexira]

Spanning tree protocol is under lan, try enabling dos protection under firewall, just as a test.

 

[Syntax]

I'm curious to see where this goes, I have a rt ac3200 on 380.66_4 and have random bouts with latency while gaming... Kinda figured it wasn't my problem. But now I feel like I should take a look

Sent from my ONE A2005 using Tapatalk

 

[Vexira]

I'm curious to see where this goes, I have a rt ac3200 on 380.66_4 and have random bouts with latency while gaming... Kinda figured it wasn't my problem. But now I feel like I should take a look

Sent from my ONE A2005 using Tapatalk

try adatpive qos, i have notice though that when i was on 8/1 adsl2+, it stablised my connection.

 

[Vexira]

aslo see if the cable modem is upto date, also check to see that its in bridge mode and theirs no double nat.