Wildcards in reverse DNS

Karl Auer kauer at biplane.com.au
Sun Jan 7 01:05:38 UTC 2007

On Sun, 2007-01-07 at 00:15 +0100, Sten Carlsen wrote:
> > Hm. So having several million trillion addresses PER SUBNET (2^64) still
> > isn't enough for you?
> > 
> YES, if they were available. Since they are used for the MAC address
> reall life will provide only ONE out of those 2^64.

?!? You can put as many addresses as you want on one interface - the MAC
address stuff is only for stateless autoconfiguration. Much more
importantly, you can have 2^64 different hosts (or 2^64 different
interfaces) in a single subnet - more if you extend your host part beyon
64 bits. That is more addresses than there are MAC addresses - more IP
addresses than there are *possible* MAC addresses...

Perhaps I misunderstand your point. What exactly is the problem as you
see it?

> MAC addresses are supposed to be unique so only one out of the possible
> addresses will be used; except if privacy addresses are being taken into
> account.

There is no problem at all with you and me sharing a MAC address as long
as we have a router between us...

Regards, K.
Karl Auer (kauer at biplane.com.au)                   +61-2-64957160 (h)
http://www.biplane.com.au/~kauer/                  +61-428-957160 (mob)

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