Network

At some point I got tired of IPv4 and NAT and started to love IPv6, especially for situations when each device needs to have its own globally routable address and I don’t want to write another port forwarding rule. Unfortunately, there are plenty of ISPs that do not support IPv6 and I’ve been unlucky to have one of those for the past several years. But among various changes in my life I now have new ISP (DIGI España) with IPv6! Of course things can’t just work out of the box, especially when someone like me wants to have more control over their network. ...

We all know where the 127.0.0.1 is, and most of us probably remember some well-known public DNS servers like 1.1.1.1 or 8.8.8.8. Most of us prefer to write IPv4 addresses in a dot-decimal notation, consisting of four octets (four decimal numbers) each ranging from 0 to 255. “In some cases of technical writing, IPv4 addresses may be presented in various hexadecimal, octal, or binary representations.” – Wikipedia Four octets means 32 bits, and 32 bits can be represented as a single decimal number. For example: 127 * 256³ + 0 * 256² + 0 * 256 + 1 ...