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.