Advanced tab > Guest Network > Allow guests to see each other and access my local network
When unchecked, users connecting to this guest network can only access the Internet and cannot access any other devices in the same network or in other networks, including the main network and the wired network. In addition, all the clients in this guest network cannot access router's management GUI or any other services provided by the router (for example, ReadySHARE Storage, ReadySHARE Printer... if the router supports these functions).
When checked, users connecting to this guest network can access not only the Internet but also all devices on all local networks, including the main network and the wired network.
