05-10-2009 09:18 AM - edited 03-06-2019 05:38 AM
I know how to get the interface ID from a mac BUT whats that goto do with the eui-64 address obtained from a ipv6 128 bit address? So why would I use the 64 bit ipv6 address when working with the interface ID?
05-10-2009 11:10 AM
Hello Baljit,
>> So why would I use the 64 bit ipv6 address when working with the interface ID?
That is the host portion.
the eui-64 is a sort of abstraction of MAC addresses and is the result of a transformation o the 48 bits MAC address by adding two bytes.
As a result of this an eui-64 compliant prefix is a /64 with 64 bits of network and 64 bits of host part where the eui-64 is placed.
Link local addresses use the eui-84 standard for example and it is quite common to use eui-64 addresses on lan also for unicast global addresses
see
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-addrg_bsc_con.html#wp1038809
and
http://rfc-ref.org/RFC-TEXTS/4291/chapter2.html#d4e441801
Hope to help
Giuseppe
05-10-2009 12:28 PM
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