In most cases, this light needs to be lit solid (white, green or amber) or flashing to show that internet activity is happening. This light is often labeled as Internet, WAN, or marked with a symbol of globe or a satellite flying around a globe. Most routers have a single light dedicated solely to the status of the internet connection. When you lose the internet, here's how you can use some of them to troubleshoot the problem. What isn't obvious is what the hell the purpose of these lights is. Actually, I was being facetious saying 'you may have noticed' because these lights are totally obvious.
You may have noticed that your router and modem have, like, a ton of constantly blinking lights on them.
