IPV6 addresses

Colin Law clanlaw at gmail.com
Mon Jun 25 10:09:43 UTC 2018

When I run ifconfig on an 18.04 machine which has been upgraded over
several versions I see an IPV6 address generated from the MAC address
of the form
which has been generated using the technique in

On another machine with a fresh install, however, the fe80:: address
does not have any obvious relationship to the MAC address and has not
got ff:fe at the appropriate place. I deduce from this that there
other allowed techniques for generating the address but I can't find
any reference to them anywhere.  Can anyone elucidate?


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