How to confirm whether the router is connected to internet through Diagnostic function
This Article Applies to: 
                
            | For instance, if you want to check the connection of the www.google.comyou can achieve it through Diagnostic. Step 1 Open a web browser and type http://tplinklogin.netor the default IP address of your router in the address bar (The default IP address is at the bottom of the router. Usually it’s http://192.168.0.1 or http://192.168.1.1).PressEnter.  Step 2 Type the username and password in the login page, the default username and password are both admin.  Step 3 Click System Tools and Diagnostic. Step 4 Select one of the diagnostic tools: Ping. Note: Ping troubleshoots connectivity, reachability, and name resolution to a given host or gateway. Ping: Step 5 Select the diagnostic tool: Ping.  Step 6 Type the IP Address/Domain name of the PC/server you want to ping the IP Address/ Domain Name.  Step 7 Click Start to diagnose. The following result indicates the connection is ok.  Note: If it’s successful to ping an IP address while not successful to ping the domain name, it’s a DNS issue. | 
You may go to Network---WAN to change the DNS server to 8.8.8.8---Save.

Pinging the domain name would be successful after you change the DNS server.
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