This is the Troubleshooting outcome after reading of the 20 characters limitation posted by “thombe.”:
1) I did confirm there is a 20 characters limit if address reservation is being set.
2) I noticed if the device name is less than 20 characters, you can rename it to have a total of up to 20 characters thru the “Advanced -> Setup -> Lan Setup -> Address Reservation” page, and it will not allow you to go over the 20 characters limit, therefore automatically avoiding the error page.
3) I realized that if the device name was automatically populated and was over 20 characters, you will not be able to shorten the name to 20 characters or less as you are setting the Address Reservation.
4) I realized that if the device name was automatically populated and was over 20 characters, you will need to manually rename it to 20 characters or less by going to the “basic -> attached devices” page, clicking on the device, renaming the device to 20 characters or less, in order to set Address Reservation to that device.
5) I also realized you can work around the 20 characters limit by renaming the device thru the “basic -> attached devices” page, clicking on the device, renaming the device to 20 + characters, only after the device have been configured to have an address reserved.
