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

Wed Jan 26 00:20:27 UTC 2011

Owen DeLong wrote:
> ......
> I suspect that there are probably somewhere between 30,000
> and 120,000 ISPs world wide that are likely to end up with a /32
> or shorter prefix.

A /32 is the value that a start-up ISP would have. Assuming that there is a
constant average rate of startups/failures per year, the number of /32's in
the system should remain fairly constant over time. 

Every organization with a *real* customer base should have significantly
shorter than a /32. In particular every organization that says "I can't give
my customers prefix length X because I only have a /32" needs to go back to
ARIN today and trade that in for a *real block*. There should be at least 10
organizations in the ARIN region that qualify for a /20 or shorter, and most
would likely be /24 or shorter. 

As Owen said earlier, proposal 121 is intended to help people through the
math. Please read the proposal, and even if you don't want to comment on the
PPML list about it, take that useless /32 back to ARIN and get a *real
block* today.

Tony