When you open this page, the router automatically performs a series of self-diagnostic test and displays the results once completed:
Be sure to read the help text closely. If the router fails some of the tests, you may not be experiencing a real problem.
If you want more information on a particular test or find out what to do if a test fails, click on the Help link next to its PASS/FAIL indicator.
The help text tells you what it means when the router passes or fails the test, and gives troubleshooting tips to use if the test failed.
Return to the Device menu options.