On Monday, when my home was without power, I was forced to go to a local coffee shop to work on their Wifi network. How did I know when the power was back on and it was safe to go home. I pinged the router on my home network. When it responded, I knew the power was back on and it was safe to return home to finish my work.
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Scotty says
Ah, but I see that you are not soo geeky that you have your firewall set to drop ping requests, so while you fly a geek flag, you are, in fact, quite normal 😉