Your WN822N is V3, right? Try chipmaker's driver(Realtek RTL8192CU) here....

Main Router(Wi-Fi)>>>><<<<(Wi-Fi)WR841N(LAN)-----(LAN)PC Is it what you need? WR841N has WDS mode instead of client mode. But in WDS mode, devices can also connect to WR841N wirelessly to access...

It might be a computer issue or cable issue. Did you try different cable or PCs to connect LAN port of WR740N? DHCP is enabled on your PCs, right? If you configure a static IP, can you log in web...

EAP110 supports Passive PoE while SG1008P works with IEEE 802.3af compliant PDs which supports Standard PoE. That is to say, TL-SG1008P cannot power on EAP110 byitself. TL-SF1008P and TL-POE10R...

Wireless powerline extender can be added in existing powerline network and help to improve Wi-Fi signal.

Wireless MAC Filtering is disabled, right? Try to reset the router to factory defaults first. Reconfigure it.