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Ethernet vs WIFI : funny IP addresses

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Mathieu

Regular Contributor
Hello everybody
1. I have noticed that certain devices on my home network, when plugged into a LAN port (either directly in the router or in a TP link switch) are getting an IP address outside of the boundaries of the DHCP pool: eg 10.x.x.x vs 192.z.z.z.
What could be causing it?

2. The above devices, when connected via WiFi, are behaving as expected. I also notice that for some of these, when plugged by cable, both the wifi and ethernet interfaces are showing in the network map, with the same IP address but a distinct MAC. Only one MAC was used for the DHCP reservation...
Is there a way to tell the router to ignore one when the other is active, as I suspect a duplicated IP address would do no good to my setup?

Thanks for your help, and happy epiphany (as applicable).
 
What could be causing it?

You have another device on your LAN that runs a DHCP server. You will have to track it and shut it down.
 
You have another device on your LAN that runs a DHCP server. You will have to track it and shut it down.
Thank you for the lead.
Will go hunting for the rogue server now.
 

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