Could some one kindly explain what is the difference between IPv6 Unique Local Addressing and Link-Local addressing? I understand that Link-Local is for within a network, but isn't Unique Local Addressing similar to that?
IPv6 ULA vs Link-Local
ipip addressip-link-localipv6
Best Answer
IPv6 link-local addresses are required addresses, and they cannot be routed. They are confined to a single link, and every link has the same link-local network. The link-local address range is
fe80::/10
. From RFC 4291, IP Version 6 Addressing Architecture:ULA addresses can be routed (except on the public Internet). There are some rules to ULA addressing. The ULA address range is
fc00::/7
, but the first half of the addresses,fc00::/8
, is reserved for assignment by a global authority. The second half of the ULA address range,fd00::/8
, is available for local use, but the 40-bit Global ID must be randomly chosen. From RFC 4193, Unique Local IPv6 Unicast Addresses: