Using IPv6 with prefixes shorter than a /64 on a LAN

Eugen Leitl eugen at
Wed Jan 26 05:29:47 CST 2011

On Wed, Jan 26, 2011 at 01:33:05AM +0000, Nathan Eisenberg wrote:
> > Even if every RIR gets to 3 /12s in 50 years, that's still only 15/512ths of the
> > initial /3 delegated to unicast space by IETF. There are 6+ more /3s remaining
> > in the IETF pool.
> That's good news - we need to make sure we have a /3 for both the Moon and Mars colonies.  ;)

A /64 is barely enough bits for a ~2 m resolution on Earth surface, and
barely to the Karman line. In practice you'd aim for ~um resolution for all
major gravity wells in this system (DTN is already flying, there's
a Cisco box in Earth orbit, Moon and Mars are next).

(And of course if you're you're going to multiply above by 10^11, 
or so. Eventually).

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