At home I have a little PC that acts as a NAS and NFS server. This server is being used only once or twice a day, so it would be wasteful to keep it always on. I programmed the server so it shuts down itself automatically. I won't go into details how, since that's not the subject, I will only tell that it includes monitoring the TX counter of the server's ethernet interface.
The point is, that this server shuts down automatically, so whenever I want to access it, I need to, well, turn it on. Doing this manually is unpleasant when one is used to systems being available round the clock, so I created autowol to help. As soon as I want to access my NFS server, autowol detects that it is down and sends a WOL (Wake-On-LAN) packet to turn it on. My NFS server boots up in under 15s, so the lag is very reasonable.
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