Users often confuse these. For the DIR-850L specifically:
Depending on your firmware version, select or WISP Repeater mode.
Ensure the DIR-850L is close enough to the main router to catch a strong signal. To help customize this setup, let me know: What is the of your main router? Are you connecting to a 2.4 GHz or 5 GHz network? Approximately how far apart will the two routers be placed?
Open a browser and go to http://dlinkrouter.local or 192.168.0.1 . Login. (Default username: admin , Password: blank or password ).
Connect your computer or phone to one of the of the Go to product viewer dialog for this item.