How to Troubleshoot router problems
Log in to the router
Point your web browser at your router’s IP address (see the TCP/IP tab in System Prefs > Network > Advanced), then check to see if the router’s status page indicates an issue with your internet connection.
Ask your provider
If the connection is down but you can get online on your phone, check your service provider’s status page for outage reports. Its support pages should give its required settings, plus contact details.
Resolve DNS issues
If your router has a connection but pages don’t load, your provider’s DNS server, which connects web addresses to servers, might be in trouble. Follow bit.ly/odnsma to see whether this free service fixes it.