How is EUI-64 address calculated?

You could (in interface configuration mode of your Cisco IOS router) enter the command:

1. ipv6 address 2000:1::/64 eui-64.
2. SCENARIO: Router R1 has a MAC address of 0015.2BE4.
3. Step #1: Split the MAC address in the middle:
4. Step #2: Insert FF:FE in the middle:
5. Step #3: Change the format to use a colon delimiter:

What is EUI-64 format?

EUI-64 (Extended Unique Identifier) is a method we can use to automatically configure IPv6 host addresses. An IPv6 device will use the MAC address of its interface to generate a unique 64-bit interface ID. However, a MAC address is 48 bit and the interface ID is 64 bit.

What is Link-Local unicast?

A link-local address is a unicast address that is confined to a single link, a single subnet. Link-local addresses only need to be unique on the link (subnet) and do not need to be unique beyond the link. Therefore, routers do not forward packets with a link-local address.

What type of address is a link-local address?

In computer networking, a link-local address is a network address that is valid only for communications within the network segment or the broadcast domain that the host is connected to.

How link-local addresses are made?

After a global IPv6 unicast address is configured on the interface, an IPv6 link-local address is automatically generated. After the ipv6 address auto link-local command is run on the interface, an IPv6 link-local address is automatically generated.

What is link-local IPv6 address?

A link-local address is an IPv6 unicast address that can be automatically configured on any interface using the link-local prefix FE80::/10 (1111 1110 10) and the interface identifier in the modified EUI-64 format. Link-local addresses are not necessarily bound to the MAC address (configured in a EUI-64 format).

Are link-local addresses routable?

When a globally routable or a private address becomes available after a link-local address has been assigned, the use of the new address should generally be preferred to the link-local address for new connections but communication via the link-local address is still possible.

What is link-local unicast?

What is IPv6 link-local address?

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.

How do I create a local address link?

Linux Kernel versions < 4.12 (Legacy IID derivation)

1. Create a modified EUI-64 address. Extend the 48-bit address to a 64-bit address, which is used as MAC address in IPv6.
2. Create an IID. Set the address as globally unique.
3. Create a link-local address. Add the link-local prefix FE80::/10 to the IID.

What are link-local addresses for?

Link-local addresses are designed to be used for addressing on a single link for purposes such as automatic address configuration, neighbor discovery, or in the absence of routers. It also may be used to communicate with other nodes on the same link. A link-local address is automatically assigned.

Is 127.0 0.1 and localhost the same?

Localhost is often considered synonymous with the IP address 127.0. 0.1. Although they are functionally the same, there are substantial differences between localhost and 127.0. 0.1.