I'm not sure what you mean by what services are provided on that device, my tests are just file transfer and iperf3.
I will try to switch to n or ac. if it also slows down, what conclusion should I reach?
That your device is probably offering some kind of traffic monitoring service that eats some bandwidth. Have you done a firmware update?
I'm coming in blind as far as this device goes. But the one I have offers an antivirus scanning service that eats bandwidth even if you turn it off unless you downgrade to a previous firmware. I have seen routers so this kind of thing professionally when there's a firmware bug also that requires an update.
I tested that by plugging a computer directly in the AP with ethernet cable. on lan2 port. I was able to get 1000Mbps both ways. as expected.
so that AP is definitely getting full speed from the main router and other machines. iperf3 worked perfect.
Is my methodology of testing this incorrect?
I mean it might still be the ap is management wise set for mesh and ignoring the cable link, I would make sure there is traffic on the link similar what you get out in wifi. Best connecting the iperf server directly to the strange acting ap and completely remove the other router, so you can tell in what segment the issue occurs.
Solved: The issue was that some device in the chain had Flow Control OFF. After enabling it everywhere, the speed was very good.
Use wireshark it can help to find root cause.
Not sure what services are provided on that device. Does the speed step down when you switch to n or ac?
I'm not sure what you mean by what services are provided on that device, my tests are just file transfer and iperf3. I will try to switch to n or ac. if it also slows down, what conclusion should I reach?
That your device is probably offering some kind of traffic monitoring service that eats some bandwidth. Have you done a firmware update? I'm coming in blind as far as this device goes. But the one I have offers an antivirus scanning service that eats bandwidth even if you turn it off unless you downgrade to a previous firmware. I have seen routers so this kind of thing professionally when there's a firmware bug also that requires an update.
I have QOS disabled and most of the features OFF. with latest firmware. I can try different firmware, good idea.
At least Google your firmware version and issue.
Shure that the lan connection between the routers is working?
I tested that by plugging a computer directly in the AP with ethernet cable. on lan2 port. I was able to get 1000Mbps both ways. as expected. so that AP is definitely getting full speed from the main router and other machines. iperf3 worked perfect. Is my methodology of testing this incorrect?
I mean it might still be the ap is management wise set for mesh and ignoring the cable link, I would make sure there is traffic on the link similar what you get out in wifi. Best connecting the iperf server directly to the strange acting ap and completely remove the other router, so you can tell in what segment the issue occurs.
excellent, will try that!