Unique Local Unicast Addresses
When a company decides to implement IPv6, they can choose to use global unicast addresses. To do so, they obtain a prefix from an ISP, do some subnet planning as just discussed in this chapter, and start using the addresses.
Alternately, a company can choose to not use global unicast addresses, but instead use unique local unicast addresses. These unique local addresses act somewhat like private IPv4 addresses, in that the company’s network engineer can pick some values to use without registering any public addresses with an ISP or other organization. So, although not the literal equivalent of private IPv4 addresses, they can serve the same overall purpose.
Although the network engineer creates unique local addresses ...
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