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What is the difference between link-local and unique local IPv6?
Link local addresses are used in one single network segment, they can’t be routed. Unique local addresses can be routed, but only within one routing domain. So an ISP can choose to use ULA for services which can’t be publicly accessible.
What is ULA in IPv6?
A unique local address (ULA) is an Internet Protocol version 6 (IPv6) address in the address range fc00::/7. Its purpose in IPv6 is analogous to IPv4 private network addressing. They are routable only within the scope of such private networks, but not in the global IPv6 Internet.
What is IPv6 link-local?
IPv6 link-local addresses are addresses that can be used to communicate with nodes (hosts and routers) on an attached link. Packets with those addresses are not forwarded by routers. At least, they should not be. There have been cases where routers would happily forward packets with a link-local source address.
Can I ping IPv6 link local address?
To ping using IPv6 between two link-local hosts Use ipv6 if on Host A to obtain the link-local address for the Ethernet interface. Example: The link-local address of Host A is fe80::210:5aff:feaa:20a2. Use ipv6 if on Host B to obtain the link-local address for the Ethernet interface.
Is the link local address required in IPv6?
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.
When to use link local or ula address?
Link-Local addresses are designed to be used for addressing on a single link for purposes such as automatic address configuration, neighbor discovery, or when no routers are present. Routers must not forward any packets with Link-Local source or destination addresses to other links. ULA addresses can be routed (except on the public Internet).
What is the difference between IPv6 link local address and global unicast address?
Here is a link to a video (available on Cisco Support Community) that demonstrates the key difference between the IPv6 Link-Local Address and global unicast address in Cisco IOS routers: ! hostname R1 ! ipv6 cef ! ipv6 unicast-routing ! interface Loopback10 no ip address ipv6 address 2010::/64 eui-64 !—
What does the local significance rule of IPv6 mean?
Therefore, the local-significance rule of the addresses means that, so long at the IID of the link-local address is unique on that segment, all is right with the world. IPv6 nodes use either EUI-64, privacy addressing, or stable-SLAAC to derive the IID (i.e., the last 64 bits) of the link-local address.