USB 10/100/100 LAN is not working

Question

Level 1

4 points

USB 10/100/100 LAN is not working

I have MacBook Pro 14-inch (M1 pro) running on Monterey 12.2.

My ethernet cable is connected directly to my monitor Dell U2722DE and the macbook is connected to the monitor using the USB-C DP 1.4 cable which allows charging the laptop (max PD of 90W), video, audio, ethernet, and peripherals passthrough.

This allows me to connect everything to the monitor and the laptop has only one DP 1.4 cable going to the monitor. While everything else is working fine, I noticed that the ethernet connection is not working. I am currently relying on the Wifi connection.

First of all, the USB 10/100/100 LAN network interface is not detected on all thunderbolt 4 ports (only 1 successfully detects the interface). Even then, the status keeps saying "Cable Unplugged: ither the cable for USB 10/100/1000 LAN is not plugged in or the device at the other end is not responding.".

The IPv4 is set to "Using DHCP". Please let me know what can be done here.

Rishabh.

MacBook Pro 14″, macOS 12.2

Posted on Apr 16, 2022 6:28 AM

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Answer 1

lllaass

Level 10

210,513 points

Apr 17, 2022 9:00 AM in response to rishabh570

DO the lights for the ethernet connection (by the receptacle on the monitor) show that cable is connected and monitor is getting activity? See page 31 of the manual:

https://dl.dell.com/content/manual39176859-dell-u2722de-monitor-user-s-guide.pdf?language=en-us

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Answer 2

rishabh570 Author

Level 1

4 points

Apr 17, 2022 11:35 PM in response to lllaass

Yes, the lights on the monitor receptor are on.

I managed to get it working by using a new Cat7 RJ45 cable (25 feet). But I'm observing a significant speed drop on the wired connection. Getting 80-90 Mbps on ethernet while the Wifi connection easily gives more than 300 Mbps.

Wanted to confirm if this is happening solely because of the wire's length or if there can be other factors at play?

Thanks for the help!

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Answer 3

BobHarris

Level 9

56,873 points

Apr 18, 2022 7:36 PM in response to rishabh570

2 questions. Did you make the ethernet cable, or did you buy it?

If you made the cable, then are you sure all your pins are correct? If you do not get the pins correct you can drop from gigabit to 100 megabit or worse 10 megabits.

If you purchased the cable, is it rated for 1 gigabit? There are 100 megabit cables that basically just use 4 wires and not 8.

According the the DELL web site the U2722DE has USB 3.1 gen 2 10gigabit/sec USB ports, so I should be able to drive a gigabit ethernet adapter.

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Answer 4

Jeff_W.

Community Specialist

Apr 17, 2022 8:25 AM in response to rishabh570

Welcome Rishabh570,

It appears that you're trying to use the ethernet connection from your Dell monitor to connect your MacBook Pro to the internet. Since you're receiving an error message with the LAN network interface, be sure to check for any software or firmware updates that may be available. Below we have provided some helpful resources that can assist you as well:

• Troubleshoot external networking devices on Mac

Best wishes!

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Answer 5

lllaass

Level 10

210,513 points

Apr 18, 2022 1:32 AM in response to rishabh570

25ft is fine. The max length of Cat7 cable is 100 meters

https://www.toolbox.com/tech/networking/question/what-is-the-maximum-length-of-cat-7-cable-081611/

Is the connection directly to the router? If you connect your new cable to another computer or your computer with adapter what is speed?

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Answer 6

rishabh570 Author

Level 1

4 points

Apr 19, 2022 10:34 AM in response to lllaass

Tried the ethernet cable on my HP pavilion laptop, getting the same 80-90 Mbps range.

I observed better speed on m1 mac today for a brief period in the morning though. I don't usually have many device connected to the internet at the same time also, max would be 4 devices at once.

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Answer 7

rishabh570 Author

Level 1

4 points

Apr 19, 2022 10:37 AM in response to BobHarris

I bought it from Amazon. I did observe close to 800 Mbps in the early morning today so don't think the cable is the bottleneck here.

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USB 10/100/100 LAN is not working

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