Slow wired speeds on RT-AX86U

fifty

New Around Here
I've been trying to set up AiMesh with a wired connection between my RT-AX86U and RT-AC68U. For the past two weeks, I've been attempting to diagnose the issue with my free time and can't seem to figure this out.

I have symmetrical gigabit internet and have used both the stock firmware (3.0.0.4.386_45934-gb23bdac) and latest merlin (386.4) and have factory reset, cleared nvram, and rebooted/flashed firmware many times.

In all the configurations below, everytime I run my speedtest on the router looks something like this (consistently):

1641711981826.png


My final setup would ideally be this with AiMesh turned on:
ONT -> RT-AX86U -> RT-AC68U -> Desktop PC


However, for the sake of trying to figure why I'm only getting 1mbps upstream from my desktop speedtest, this is what the setup looks like:
ONT -> RT-AX86U -> Desktop PC with AiMesh turned off speed test:

1641711825161.png



I read some posts about turning QoS off (nvram set qos_enabled=0, nvram commit, service restart_qos, service restart_firewall) which helps a bit, however the upstream is still very off:

1641712108685.png



I have an old RT-AC87U which when I use in place of my RT-AX86U and works flawlessly (going to have to take my word for this one, I get about 800mbps/800mbps via wired.

Some notes.. I used many other speedtest sites, I only included the ones from fast.com but they are similar across the board.
The wifi speeds are also fine (~200+ down/up), but this doesn't matter as much to me as I only stream videos on WiFi, and I want to leverage my gigabit speeds on my Desktop computer where it matters.

I have also tried turning on jumbo frames (doesn't do anything)

List of things I've tried with reboots after changing these settings:
- Reset to factory default and only changed one or two settings below...
- Turning off AiMesh
- Turning off QoS via SSH (helped download speeds the most and upload a little)
- Turn on jumbo frames (didn't notice anything)
- Using different ports
- Swapping out ethernet cables (using RT-AC87U proves the cable isn't the problem)
- Used a switch in between RT-AX86U and Desktop, no difference


Any thoughts or suggestions? I'm pretty close to returning both my new ASUS routers unless I figure out WTF is going on with the wired connections.
 

eibgrad

Part of the Furniture
It might be helpful if we knew what the performance was between the RT-AX86U and the desktop, vs. the RT-AX86U and internet. IOW, test them independently rather than just the complete path from desktop to the internet. It might provide a clue to where the problem actually lies.
 

fifty

New Around Here
It might be helpful if we knew what the performance was between the RT-AX86U and the desktop, vs. the RT-AX86U and internet. IOW, test them independently rather than just the complete path from desktop to the internet. It might provide a clue to where the problem actually lies.
Any suggestions on best way to do that?
 

eibgrad

Part of the Furniture
Admittedly, the fact you're using OEM firmware doesn't make that easy. With Merlin, you could install Entware (directly or via AMTM) and then install iperf3. From a shell (SSH) on the router, you could then run the following command to test the upload speed from the router to the internet.

Code:
iperf3 -c la.speedtest.clouvider.net -p 5209

Also the download speed using the -R option.

Code:
iperf3 -c la.speedtest.clouvider.net -p 5209 -R

Similarly, you could run iperf3 as a server on the router and test the upload/download speeds using the desktop as an iperf3 client.

Finally, test the complete path w/ iperf3, from desktop to internet (you might want to try this first before making any changes to the router's firmware).

Heck, for all I know, just installing Merlin might fix the problem.

P.S. Note, as an iperf3 client or server, the router can't compete w/ a desktop platform. It will top out somewhere well short of the desktop, but it should still be well into the 100's of Mbps, good enough to see if you can get past the current pathetic limits of 1 and 10Mbps upload.
 
Last edited:

burt35

New Around Here
i had this issue when i first setup router i used qos bandwidth limiter for certain ports but this cut my bandwidth using speed tests in half so i reset router and didnt use qos i havnt had a problem since.
 

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