When I was learning how to set up a WireGuard VPN for remote access to my home network, the tutorial I was following recommended that I configure something called Dynamic DNS (DDNS). I had no idea what this was or why it was necessary here. But, it didn’t take long for my curiosity to send me down a rabbit hole regarding this, after which I learned that DDNS does solve an important problem. Namely, that without it your VPN might work just fine one day and mysteriously refuse to work the next. The Problem# Your home router joins two networks: a local area network (LAN) for your devices, and your internet service provider’s (ISP) upstream network, known as the wide area network (WAN), which connects you to the internet. Your router lives on two networks, which includes the LAN your devices share, and the WAN that reaches the rest of the internet. When your router connects online, your ISP assigns it a WAN IP address. This particular IP address is different from the one you use to log…
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