Where to buy Internet IP addresses
nonobvious at gmail.com
Mon May 4 16:03:31 CDT 2009
> You have RFC3041 and similar techniques, stateless autoconfig, and a
> variety of other general things that make it really awful for the default
> ethernet network size to be something besides a /64.
> I would definitely prefer to see a /56, or maybe a /48, handed out
When I first started looking at IPv6, the bottom 64 bits were
divided into the bottom 48 bits for a MAC address
and 16 more bits that could either be zeros or could be
used as a subnet number in roughly Novell Netware style
(modulo a local/global bit if you needed one).
If you wanted to assign addresses instead of autoconfiguring,
that was ok too, but it was obvious how autoconfig would work.
It was simple, clean, and flexible, and obviously intended that
an ISP would hand most customers a /64, which could easily
handle an entire building or medium-complexity campus.
Then I ignored those bits for a decade or more,
because nobody's IPv6 was much more than experimental.
When I came back, I found this ugly EUI-64 thing instead,
so not only was autoconfiguration much uglier,
but you needed a /56 instead of a /64 if you were going to subnet.
Does anybody know why anybody thought it was a good idea
to put the extra bits in the middle, or for IPv6 to adopt them?
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