For the sake of completeness: Another idea I heard last week (sorry, I forget who suggested it) is to use the number of seconds since some epoch (say 2002.01.01 0000 UTC) when the network was established, as the probably-unique prefix.
Though I do wonder whether we might see multiple networks automatically "turned on" at the same "round number" time, causing collisions. Keith > As a method of doing globally unique site local addressing: > > Assuming aggregability is not an issue within a 'site' sized network, > consider generating site local subnet identifiers at the router, based on > IEEE EUI-48 identifiers (such as MAC addresses). > > For example, generate as fec0::/12: > > 12 bits: fef > 48 bits: MAC > 4 bits: 0 or subnets > > or, if we don't want them in fec0::/10 > > 10 bits: fe0 > 48 bits: MAC > 6 bits: 0 or subnets > > The '0 or subnets' is to allow for the possibility of choosing one EUI-48 on > a router and using that to allocate all appropriate subnets. > > By piggybacking on the existing registration scheme, we generate "unique" > site-local subnet ids at the router without needing external registration or > administration. > -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
