What prefix is used to form a link-local IPv6 address?

1,545 pts.
Tags:
Ethernet
IP address
IP addressing
IPv6
Networking
prefix
prefixes
Could you please explain this to me as I couldn't understand it after so many discussions: What prefix is used to form a link-local IPv6 address? And what would the link-local address for a host with an Ethernet interface with a MAC address of 00:E0:00:97:E7:B8 be?
ASKED: March 26, 2009  8:41 PM
UPDATED: April 1, 2009  8:15 AM

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Hi

a link-local IPv6 address uses the prefix fe80. This is described in RFC 4291. Also for other address types there is a good information RFC which provides an overview of special use addresses. It is RFC 5156.

If the MAC-based interface ID is used, it is built according to the EUI-64 format, by extending the MAC address to 64 bits by adding FF FE between the 3rd and 4th Byte and “locally administered bit” must be set (2nd bit)

Cheers, Silvia

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