Subnetting with Unique Local IPv6 Addresses
Subnetting using unique local addresses works just like subnetting with global unicast addresses with a 48-bit global routing prefix. The only difference is that with global unicasts, you start by asking for a global routing prefix to be assigned to your company, and that global routing prefix might or might not have a /48 prefix length. With unique local, you create that prefix locally, and the prefix begins with /48, with the first 8 bits set and the next 40 bits randomly chosen.
The process can be as simple as choosing a 40-bit value as your global ID. 40 bits requires 10 hex digits, so you can even avoid thinking in binary, and just make up a unique 10-hex-digit value. For example, imagine you chose ...
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