It's plug and play. No need to configure the switch. It's the router that you should configure.

1. It might be affected by program, antivirus on your laptop. 2. Is the switch working? Connect a PC directly to the switch. 3. Do you have any filtering or access control setup on the router?

Seems like you've set up as access point. If you want it to be router, using the WAN port, login the modem, go to Advanced>Operation mode, select wireless router mode and connect VR200 LAN to VR600...

Log in the router http://tplinkwifi.net, go through Quick Setup, select PPPoE connection type and enter your username and password. Follow the manul in the box. BTW, do not show us your crendentail...

There is no USB printer controller for Linux system. It's not compatible.

How do you set up the C2? Are you using WAN port?