i.MX ProcessorsのトピックRe: imx8mplus : Random IP getting assigned to ethernet interface when the link is UP

imx8mplus : Random IP getting assigned to ethernet interface when the link is UP

ssuresh — Wed, 13 Mar 2024 06:55:22 GMT

Hi NXP Team,

Please find the test procedure:

1. Connect the board eth0 port to a Linux PC via ethernet cable

2. After one minute, check the ethernet interface using ifconfig

A random IP is seen for eth0 interface as shown below:

Is this an expected behaviour?

Thank you!

Re: imx8mplus : Random IP getting assigned to ethernet interface when the link is UP

jimmychan — Wed, 13 Mar 2024 08:19:18 GMT

You could connect the board to a router. So, it could get the IP from the router.

Re: imx8mplus : Random IP getting assigned to ethernet interface when the link is UP

ssuresh — Wed, 13 Mar 2024 08:51:02 GMT

Yes, that is true !! When board is connected to a router, it will get IP from router.

But, when we connect our board to another board or laptop over ethernet, we see an IP is getting set in the range 169.xx.xx.xx.

We would like to know who is assigning this IP; is it NXP itself or the other end i.e lap/board? Does this happen since ethernet is expecting a dynamic IP when the link is UP?

Re: imx8mplus : Random IP getting assigned to ethernet interface when the link is UP

jimmychan — Thu, 14 Mar 2024 02:13:17 GMT

It is normal. When no dhcp, no IP assign to the board. Then it will set this 169.xx.xx.xx. You could set the IP to board manually.

Re: imx8mplus : Random IP getting assigned to ethernet interface when the link is UP

ssuresh — Thu, 14 Mar 2024 03:36:08 GMT

Thanks NXP for the answer !

BR.