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[RT-N66U] Random high ping spikes on all firmwares

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CyberWalrus

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I've been encountering an issue on the rt-n66u where pings to the router on both the 2.4 and 5Ghz channels will shoot from around 1ms to 200+ms, taking a few seconds to "recover". This will happen fairly regularly, every few minutes. This doesn't really effect normal usage, but for latency sensitive use like online gaming it has a pretty massive impact.

This happens on both rt-n66u's I have, on all firmwares I've tried (stock, merlin, dd-wrt, tomato), with old/new wifi drivers, with in different locations, regardless of devices. The issue happens on completely stock settings, nothing fancy.

I'd consider it a hardware issue, but it seems strange that it effects both of the routers I own, yet I cant find anyone having similar issues.

Has anyone got any ideas to debug/fix this? Thanks
 
A long shot may be trying a small usb fan to cool the router to see if it is thermal throttling?
 
It may be interference from neighbors routers. Have you tried using inSSIDer to do a site survey?
 
A long shot may be trying a small usb fan to cool the router to see if it is thermal throttling?
The performance tuning page puts it at a fairly steady 54°C, which seems reasonable. I don't have any appropriate cooling gear but its got plenty of airflow room, so it doesn't seem likely its overheating.

It may be interference from neighbors routers. Have you tried using inSSIDer to do a site survey?
That's what I would think in most situations, but both environments I've tested in have very few surrounding routers, none on the same channel or even close. The 5GHz band has been completely empty yet the router will exhibit the issue.
 
On the RT-N66U those temps are just the radios.

The CPU temp is unknown. Worth at least a try to keep it cooler.
 
Same problem with me. On latest firmware, 5ghz wifi, I ping the router and have these sorts of things, multiple times per day; passing from 1ms to >500ms breaking the connection.
Already tried to reboot, factory reset, ...
I'm alone on the network (and do nothing at all on the network, no streaming, download), 2 meters from the router, nobody in the neighborhood...

64 bytes from 192.168.1.13: icmp_seq=27615 ttl=64 time=1.394 ms
64 bytes from 192.168.1.13: icmp_seq=27616 ttl=64 time=1.533 ms
64 bytes from 192.168.1.13: icmp_seq=27617 ttl=64 time=1.502 ms
64 bytes from 192.168.1.13: icmp_seq=27618 ttl=64 time=2.024 ms
64 bytes from 192.168.1.13: icmp_seq=27619 ttl=64 time=1.990 ms
64 bytes from 192.168.1.13: icmp_seq=27620 ttl=64 time=2.098 ms
64 bytes from 192.168.1.13: icmp_seq=27621 ttl=64 time=2.731 ms
64 bytes from 192.168.1.13: icmp_seq=27622 ttl=64 time=2.250 ms
64 bytes from 192.168.1.13: icmp_seq=27623 ttl=64 time=2.645 ms
Request timeout for icmp_seq 27624
Request timeout for icmp_seq 27625
64 bytes from 192.168.1.13: icmp_seq=27626 ttl=64 time=566.964 ms
64 bytes from 192.168.1.13: icmp_seq=27627 ttl=64 time=572.287 ms
64 bytes from 192.168.1.13: icmp_seq=27628 ttl=64 time=603.306 ms
64 bytes from 192.168.1.13: icmp_seq=27629 ttl=64 time=490.287 ms
64 bytes from 192.168.1.13: icmp_seq=27630 ttl=64 time=485.907 ms
64 bytes from 192.168.1.13: icmp_seq=27631 ttl=64 time=660.805 ms
64 bytes from 192.168.1.13: icmp_seq=27632 ttl=64 time=155.726 ms
64 bytes from 192.168.1.13: icmp_seq=27633 ttl=64 time=470.884 ms
64 bytes from 192.168.1.13: icmp_seq=27634 ttl=64 time=465.098 ms
64 bytes from 192.168.1.13: icmp_seq=27635 ttl=64 time=459
 
If you are using the higher EU channel Nos in 5GHz this could be due to regulatory compliance DFS etc. Do you also get messages in the system log about 'radar detection'?
 
Thanks mstombs.

I changed all "Auto" values to a specific one (N legacy, 40 mhz/ channel 48) and it seems to be stable now.
 

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