I have D-link DSL 2750U wireless router. My PC and notebook are connected to router by Wi-Fi. They can share files or ping each other. I have a network storage unit plugged into router by an ethernet cable. Any of the computers cannot reach that storage unit or ping it. I guess my router isolates LAN network from WLAN network. Is there a way to combine them and get the router treat all devices connected to router in a single network? Thanks.
your router shouldn't 'isolate' LAN from WLAN. As kobaltz said, make sure your not connected to the guest wireless, then try to connect to the NAS (Network Attached Storage) again. If not, check the IP of the NAS itself. If it starts with
169.254.X.X, you got a configuration error. It should start with
192.168.X.X. Try rebooting the NAS and router. Also, check your MAC address filtering, make sure the router is not blocking the NAS's MAC address.
If these solutions don't work, leave a comment and I'll look further into it. Good luck!