RJ45 connection speed reporting

[128bit]

can anyone account for how wired connection speeds are measured? two of my four wired ports have been flagged as being slow.

now there was a time when port 3 was actually slow and that could be proven by a simple speedtest. it's normally stuck in a 4k tv; so i hung a laptop on it and i couldn't break 100 mb/s. replaced the very old cable with a cat 6 and the speeds increased to a provisioned or slightly over metric as expected but the indicator never changed. i never understood the issue with port 4, as it has a 5' run now using a cat 8 wire. my guess is that the device must be reporting something, cause if i plug that cable into the laptop, the indicator changes to green! any yes, the behavior follows the device/cable no matter what port.

it's clear to me that how ever this utility works, it's assessing more than just the conductor. any thoughts?

 

[jksmurf]

any thoughts?

[EDITED] My RPi3B (not 3B+) has a 100Mps interface and when connected via Ethernet it shows yellow.

Similarly my 2019 4K Sony Bravia TV "only" has 100mbps Ethernet (what did they save specifying that?); so yellow again.

I think any client connected by Ethernet that has an interface speed less than 1G will be flagged yellow.

 

[ColinTaylor]

My RPi3B (not 3B+) has a "1G port" but only a 300Mbps interface and when connected via Ethernet it shows yellow.

The RPi3B only has a 100Mb port which is why it shows as yellow.

 

[jksmurf]

The RPi3B only has a 100Mb port which is why it shows as yellow.

You are indeed correct, I stand corrected!

I could have sworn there was one of my RPi 3B or 4B devices that was ostensibly 1GB but only ran 300Mbps.

Sorry, checking, it was actually the USB 2.0 Gigabit Ethernet Dongle I put on the Pi that gets limited to 300Mpbs. Apologies for the confusion, been a while since I used that one.

"Gigabit Ethernet over USB 2.0 (maximum throughput 300 Mbps)"

 

[ColinTaylor]

I could have sworn there was one of my RPi 3B or 4B devices that was ostensibly 1GB but only ran 300Mbps.

I vaguely remember reading about the same 300Mbps limit. But that wouldn't change the ethernet interface speed. It's either 10, 100, 1000, etc. There is no 300Mbps ethernet.

EDIT: Found it. It's the Pi 3 Model B+.

https://www.raspberrypi.com/products/raspberry-pi-3-model-b-plus/

• Gigabit Ethernet over USB 2.0 (maximum throughput 300 Mbps)

 

[jksmurf]

I vaguely remember reading about the same 300Mbps limit. But that wouldn't change the ethernet interface speed. It's either 10, 100, 1000, etc. There is no 300Mbps ethernet.

EDIT: Found it. It's the Pi 3 Model B+.

https://www.raspberrypi.com/products/raspberry-pi-3-model-b-plus/

snap!

 

[128bit]

I think any client connected by Ethernet that has an interface speed less than 1G will be flagged yellow.

so, my port 2 has a 10/100 mb/s video network recorder on it and it's all green. go figure.

i'm glad that some of the more seasoned snbers are seeing this as well. mind, you this behavior is solid on 2 different ax* devices. certainly, had me scratching.

 

[jksmurf]

so, my port 2 has a 10/100 mb/s video network recorder on it and it's all green. go figure.

i'm glad that some of the more seasoned snbers are seeing this as well. mind, you this behavior is solid on 2 different ax* devices. certainly, had me scratching.

There was a suggestion here that some devices drop speed down from Gig to 10/100 (green turns yellow) when they go into sleep mode; might be worth checking?

 

[128bit]

There was a suggestion here that some devices drop speed down from Gig to 10/100 (green turns yellow) when they go into sleep mode; might be worth checking?

so these are great questions that i, myself, have pondered. the 10/100 nvr (port2) naps most of the time cause it get little use but the port's always green. the desktop (port 1), has a 2.5g lan and it's napping as i type. it's currently, yellow. so yeah, something's going on.

the tv (port 3) is turned off and port 4 never sleeps but works flawlessly.

i've learned to live with it since the performance is what really matters. it's sad that asus didn't do a better job of testing when they released this relatively new function.