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IPv6 address scopes

IPv6 addresses fall under three scopes: global, link-local, and unique local.

Global address
This address has an unlimited scope.
Link-local
This address has a link-only scope that can be used to reach neighboring nodes that are attached to the same link. This address is automatically assigned to a network interface.
Note: FreeBSD user applications like NTP, ASUP, and NDMP cannot communicate with destinations that have IPv6 link- local addresses.
Unique local address
The address scope is limited to a local site or local set of sites. These addresses cannot be routed on the global Internet.