Orbi Assigning device to IP already Reserved

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Juice2boost wrote:

When I went to check what it did with my other devices, I noticed it set my Xbox to the same IP address as my NAS automatically. I didnt add the Xbox to my reservation list, the router automatically did it on its own. I tried unplugging the ethernet from the back of the router to the xbox, rebooting the router, waiting a couple of minutes and plugged the xbox back in. Still assigned the same IP again as my NAS reservation. Cant figure how to get it assigned to something else. Am i missing something?

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Welcome to the fascinating world of DHCP.  As you have learned, there is often a disconnect between the LAN Setup and the IP address that a device actually has.  There's a great description here: https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol 

When a device comes on, it broadcasts a DHCP request and often says, "This is the IP I had before.  Can I please have it again?", and the DHCP server looks at what is on the network, finds there is no conflict, and says, "Sure.  Keep using it."  To force a device to give up on the old IP and have the DHCP server (Orbi) look in the LAN table, there has to be a device already on the network with the address.  I have had to do this several times.  I get out an old mobile phone, define it to have the IP that my device is "stuck on".  Turn off my device.  Power on the phone.  It gets the IP.  Then, I turn the device back on.  It asks for the IP, and the Orbi says, "Sorry kid.  That's not available."  PAIN IN THE "network".

The LAN assignment table is also not "exclusive".  Orbi is happy to have someone set up multiple devices to get the same IP.  Maybe you have several iPads, but only use one at a time.

Anyway, what matters is what the Attached Devices page shows, not what the LAN reservation table shows.  Do you actually have two devices on the network with the same IP?  (I bet not.)