Re: EUI-48 globally unique site-locals (GUSL)

[Bob Hinden]

Aidan,

For each link, a router may automatically assign a site-local
address from an EUI-48 (ie a MAC address) using the following
address format:

   | 12 bits |     48 bits      |  4 bits  |       64 bits        |
   +---------+------------------+----------+----------------------+
   |   fef   | router device ID |  sub ID  | machine interface ID |
   +---------+------------------+----------+----------------------+
                  Figure 1: Address Format: fef0::/12

BTW, two bits in an EUI-48 (i.e., the g and u bits) are not needed if using this as a global token, so it could be easily compressed to 46 bits leaving two more bits for the subnet.

I am not sure this helps very much with the other problems raised.

Bob

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