"Ryan Finnie" <[EMAIL PROTECTED]> writes:
> I took a simpler route for pseudo-random non-varying mac address
> generation. Here you go:
>
> echo $(hostname)${UMID} | md5sum | \
> awk '{print "00:08:93:"substr($1,1,2)":"substr($1,3,2)":"substr($1,5,2)}'
>
> This combines the umid you expect you assign to the instance with the
> hostname of the host. That way, the mac address will be the same each
> time it boots,
Not if it boots off a different host it won't.
> For non-temporary instances, my homebrew system has a field for mac
> addresses. If it is empty, the above code is used. But for permanent
> instances, I create a completely random mac ahead of time:
>
> dd if=/dev/urandom bs=1k count=1 2>/dev/null | md5sum | \
> awk '{print
> "00:08:93:"substr($1,1,2)":"substr($1,3,2)":"substr($1,5,2)}'
This is a good system but incomplete - how do you ensure that you
don't get duplicates? It's very difficult to know what hw addresses
are on the network (ie: what macs are already taken) because not all
hosts respond to broadcast pings (UMLs don't for example).
--
Nic Ferrier
http://www.tapsellferrier.co.uk for all your tapsell ferrier needs
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