How to change an existing IP address reservation on Netgear R7800 router?

[itm]

I've installed a Netgear X4S Nighthawk R7800 to replace an old Asus router. I had a lot of IP address reservations on the previous router which I'd like to preserve. The problem is that, when I booted the Netgear router, it assigned dynamic IP addresses to a lot of them. I tried to change one of the address reservations (in the LAN setup page) - i.e. I entered the MAC address and the desired IP address for one of the unwanted dynamically-assigned addresses, but I got an error message (something like "invalid operation"), and that device never appeared on the list again (and still has its new, unwanted IP address).

I've tried power cycling the device in question a number of times but it no longer appears in the list when I try to add a new reservation.

Is it actually possible to define a new address reservation when a device has already been assigned a new, dynamic IP address?

 

[bremen1874]

I don't know about that specific device.

I'd expect to be able to add a reservation by going into the DHCP settings and manually entering the required MAC and IP. No need for the device to be listed anywhere. Next time the device requests an IP it'll get what's been reserved for it.

 

[itm]

I don't know about that specific device.

I'd expect to be able to add a reservation by going into the DHCP settings and manually entering the required MAC and IP. No need for the device to be listed anywhere. Next time the device requests an IP it'll get what's been reserved for it.

Yes that's exactly what I did - entered the MAC and required IP address. I gave me an error, ignored the request (i.e. the device continued to pick up the "new" dynamic IP address after I rebooted it, and it got dropped off the list of devices which is shown on that page (which is not a problem in itself, as you say, but looks odd)

 

[[Darkend]Viper]

Has it been listed under reserved ip addresses in the router? if so should be able to delete that, readd the mac address, there is a specific format on netgear but can't remember off the top of my head. And the IP address you want and it should sort it out.

 

[itm]

Has it been listed under reserved ip addresses in the router? if so should be able to delete that, readd the mac address, there is a specific format on netgear but can't remember off the top of my head. And the IP address you want and it should sort it out.

No it wasn't listed under the existing IP address reservations.
The problem eventually cleared itself after power cycling both the router and the device in question 2-3 times. Not sure what happened