Why does Ethernet self assign an IP address, and how do I change that?

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Level 1

11 points

Why does Ethernet self assign an IP address, and how do I change that?

I have both a MacBook Pro and MacBook Air that are on ethernet trying to attach to an ethernet router, and both self assign an IP address when connected to it.

When I connect them to my Internet router they both work fine, and get a proper 192.168 address. What is going wrong with the new router, and why can't I change the self addressing issue?

This new router is meant for a disconnected network with no Internet access.

I have restarted a few times, and wiped NVRAM too, nothing helps.

Posted on Oct 7, 2021 10:53 AM

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Answer 1

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SKing4 Author

Level 1

11 points

Oct 8, 2021 6:07 AM in response to SKing4

I was finally able to make it connect by using a manually assigned address matching the subnet on the router, setting the subnet to 255.255.255.0, and then going into the router management page and getting the gateway address. Now I can use DHCP to connect and get assigned an IP address. Wow that was confusing

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Answer 2

Oct 7, 2021 10:59 AM in response to SKing4

The router maybe is not configured to assign DHCP IP Addresses. Look in the router's manual.

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Answer 3

ku4hx

Level 7

23,472 points

Oct 8, 2021 3:43 AM in response to SKing4

DHCP automatically assigns IP addresses. In my router, it's switchable.

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Why does Ethernet self assign an IP address, and how do I change that?

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