16. Reachability Scopes of IPv6 Addresses

• Every IPv6 address has a reachability scope:

  • Same node (Loopback address, Node-local multicast address)

  • Local link (Link-local Unicast/Multicast addresses are similar to private IPv4 addresses.)

  • The IPv6 Internet (Global Unicast addresses are similar to public IPv4 addresses.)

• Network nodes can combine reachability scopes via multiple IPv6 interfaces. For example, a node may have

  • (a) link-local address, and

  • (b) global address.