I have a dual RT-AC66U B1 AiMesh system running firmware 220.127.116.11.386_40558. My main network is 192.168.1.X. My (single) Guest Network is 192.168.101.X. I cannot customize Guest network clients through the web GUI. If I try to change the icon or turn on MAC and IP Address Binding, I receive an error message about an invalid IP address when I click Apply. Presumably the complaint is tht the IP address is not on the main network. This appears to be a bug in the web GUI, since the icon can be changed via the IOS app. Does anybody know how to specify the MAC and IP Address Binding via ssh and nvram?