If there are multiple subnets on the router, Network Administrator may set up LAN-based or IP-based access control at system maintenance >> management to prevent un-authorized LAN clients from logging into the router and change the router's settings.
By default, router's management page is accessible to all the LAN client, to set up access control based on the LAN subnet, go to System Maintenance >> Management >> LAN Access Setup. Un-check the LAN subnets that are NOT allowed to access the router at Apply To Subnet.
Or you may disable Allow management from LAN to make only clients on LAN1 will be able to access the router.
Note that LAN1 is reserved for administration, so no matter what the “LAN Access Control” setting is, the clients on LAN1 are always allowed to access the router's service.
To block the second subnet from the router's management page, go to System Maintenance >> Access Control >> LAN Access Control, un-select lan2 (the LAN profile that guests connected to) in "Apply to LAN Subnet", and then apply.
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