How do I know if my internet connection problem is a result of my router or modem?

[Wyatt]

To narrow the problem down a bit try plugging the modem directly into your computer and running on that for awhile to see if the problem persists. If all is well, that'll rule out the modem and single it down to your router as the cause. If the problem continues I would suggest swapping out the physical cables, both to the modem and any cables the router. If you have other devices running into the router, unplug those also just in case. Keep the one computer that you're using to test the connection plugged in by itself. If in the end you're still experiencing issues I think a technician may need to check the actual cable line running from the wall to the modem.