Ping Latency when connected to RT-AC3200 ethernet

[sanjeevnuts]

I'm running Merlin's 380.61 firmware
I have a PC connected by wired ethernet to one of the AC3200's LAN ports. Lately I've been seeing a lot of lag in accessing websites.

Speedtest.net shows downloads of 25Mbps, which is good, but ping is in the range 800 to 1100 ms, which is very bad.

I connected the ethernet cable directly between the cable modem and PC. It gives me same download speed but ping = 9 to 10 ms

Surely, something is throttling pings when I'm connected through the router.

So far, I've replaced all my ethernet cables (including the one between cable modem and router), played with DNS settings (changing between, auto, google and opendns) and enabled/disabled CTF (which someone suggested). Nothing has helped.

The issue is with wireless clients too, the ping values are high but download speed is fast.

Can Merlin or someone advise what else I can try?

More info: Every time I connect directly to cable modem, ping drops to 10ms or less.
My PC ethernet is an Intel Gigabit chip, autonegotiated. Forcing to 100 full duplex or 1000 full duplex did not make a difference.

 

[sanjeevnuts]

Tested using a laptop with broadcom lan chip - same results. Ping latency is 10 ms when directly connected to Modem and 700 ms when connected to a lan port on the router.

 

[sfx2000]

Speedtest.net shows downloads of 25Mbps, which is good, but ping is in the range 800 to 1100 ms, which is very bad.

Speedtest.net can be a bit odd - depending on client/browser...

 

[sanjeevnuts]

will do factory reset right away. Will post here.
The new release did not say it fixed any such issues. Its only 380.62 vs my 380.61

 

[sanjeevnuts]

Did you tried to Reset factory defaults after flashing? and reconfig from beginning
/

Did a hard reset and configured manually (did not restore from a backup file).
Same results - very slow ping - 800-1000 ms.

Please give me more ideas. I don't believe everyone has this issue, so it must be a simple solution.
Don't want to up firmware from 380.61 to 380.62 unless this was a fix implemented here.

 

[sanjeevnuts]

Speedtest.net can be a bit odd - depending on client/browser...

The issue is, same combination yields 9 ms lag when connecting directly to modem but 900 ms lag when conneted to router LAN. So there is something surely happening.
Its not just a feeling of lag. I'm frequently timing out loading pages. Its very annoying.

This is output from old fashioned ping
Pinging www.google.com [206.248.151.80] with 32 bytes of data:
Reply from 206.248.151.80: bytes=32 time=950ms TTL=59
Reply from 206.248.151.80: bytes=32 time=898ms TTL=59
Reply from 206.248.151.80: bytes=32 time=947ms TTL=59
Reply from 206.248.151.80: bytes=32 time=999ms TTL=59
Reply from 206.248.151.80: bytes=32 time=982ms TTL=59
Reply from 206.248.151.80: bytes=32 time=1021ms TTL=59
Reply from 206.248.151.80: bytes=32 time=862ms TTL=59
Reply from 206.248.151.80: bytes=32 time=790ms TTL=59
Reply from 206.248.151.80: bytes=32 time=965ms TTL=59
Reply from 206.248.151.80: bytes=32 time=1006ms TTL=59
Reply from 206.248.151.80: bytes=32 time=1038ms TTL=59
Reply from 206.248.151.80: bytes=32 time=1043ms TTL=59
Reply from 206.248.151.80: bytes=32 time=1085ms TTL=59

 

[sanjeevnuts]

Same ping output when connected to the modem
Pinging www.google.com [206.248.151.80] with 32 bytes of data:
Reply from 206.248.151.80: bytes=32 time=12ms TTL=59
Reply from 206.248.151.80: bytes=32 time=9ms TTL=59
Reply from 206.248.151.80: bytes=32 time=10ms TTL=59
Reply from 206.248.151.80: bytes=32 time=12ms TTL=59
Reply from 206.248.151.80: bytes=32 time=12ms TTL=59
Reply from 206.248.151.80: bytes=32 time=16ms TTL=59
Reply from 206.248.151.80: bytes=32 time=10ms TTL=59
Reply from 206.248.151.80: bytes=32 time=10ms TTL=59

 

[sanjeevnuts]

No Adaptive Qos or AiProtection activated?
Have you tried with asuswrt firmware(asus site) to see if you got the same behavior?

No QoS, No Firewalls, No Ai Protection. Bare minimum config after firmware reset - literally admin and wifi passwords only.

Can ASUS wrt go straight over Merlin?

 

[sanjeevnuts]

Thanks to everybody, especially Sanna. The problem is fixed.

My NAS (connected wired to the router) was hogging the bandwidth by uploading files to cloud, hence everything was slow on the router.
When I was connecting directly to modem, I was stopping the cloud upload and thus getting good pings.
NAS upload is now scheduled during off peak hours.

I should have checked the "wired" tab on Traffic Analyzer, which I missed.
Hope this helps someone with similar issues.

 

[Shonk]

how do you even get a 900 ping uploading
when i upload at my max (20mbit up)
my ping goes from around 5ms to 15-35 jumping
no qos

 

[sanjeevnuts]

My service is 25 Download and 2 Upload. Its pretty easy to saturate the upload.
That is why even with 900 ms pings , download was still showing 25 Mbps.
It was delaying web page actions needing upload - like logging in, filling fields etc. - which was timing out.

I know - weird.