Network with Eero, switch, and ethernet cable

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Level 1

8 points

Network with Eero, switch, and ethernet cable

We just upgraded to fiber optic and Eero mesh network. I plugged the extra ethernet port on the Eero into our pre-existing switch for our wired in home network. From the switch is an ethernet cable to the iMac. The iMac can access the new WiFi, however, for the ethernet connection there is the "self-assigned IP" message and hence not connectivity. I have done the troubleshooting from previous posts to no avail. Any other ideas? The switch is ~5 year old and other devices connected through it are working including Apple TV.

iMac 27″, macOS 15.6

Posted on Sep 1, 2025 1:32 PM

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Answer 1

John Galt

Level 10

153,784 points

Sep 1, 2025 2:46 PM in response to BHEwert

There is no particular mystery to it, and it seems as though you're doing things correctly.

Most likely, the Ethernet cable (to encompass its terminations, ports, or a port on that switch in addition to the cable itself) is defective. An industrial Ethernet diagnostic tool is valuable in quickly tracking down faults.

Here are a few relevant Discussions you might consider reviewing:

Slow ethernet internet iMac 2017 - Apple Community

A trouble shooting guide for Ethernet port not working - Apple Community

IP address over ethernet is self-assigned when using a gigabit adapter - Apple Community

ethernet - Apple Community

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