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multi_nic and mac addresses


Tracking mac addresses is going to have to change for multi-nic. Instances
are going to have more than one mac address. It's been proposed that we
don't need to track the mac address(es) but I think it's necessary in order
to determine whether a mac is unique or not. Mac addresses don't need to be
unique across a whole implementation but they do need to be unique as far as
layer 2 networking is concerned. It will be quite a while before we run out
of mac addresses across the whole implementation so allowing duplicate macs
but preventing duplicates within a network layer two "zone" (not sure the
terminology at this point) can be handled later. I propose making a new
table for storing instance id mac address relationships. I'm also
considering randomly generating mac addresses using instance uuid as salt.



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