@Fun4ever A DHCP pool should be in the range of 172.16.10.2 - 172.16.10.254. Can you post a screenshot of the DHCP settings and error message.

@Taste66 You can see the SG-105 performance parameters in its data sheet - here.

@Fun4ever As long as you set a 24 bit mask (255.255.255.0) this should work as expected.

@Big_Daddio That's a good outcome - at least you've done a network audit and found three D-Link devices and the reason for your issue. You can revert back to the last stable FW version if you want or...

@tharrkun HW v2 and HW v5 are with differnt hardware and FW for sure. v2 final FW release is from 2018. It's pretty much outdated hence the behavior you're observing in its case.

@chaakoob Well, that's probably because when in mesh this band is used as a wireless backhaul for the mesh.