NANOG 40 agenda posted

John Curran jcurran at
Sat Jun 2 01:44:30 UTC 2007

At 5:20 PM -0700 6/1/07, Vince Fuller wrote:
>Yes, as NAT becomes ubiquitous, a larger number of private networks will
>be behind ever smaller prefixes that are assigned to sites so the per-site
>prefix length will decrease. The logical end state for this would be /32s.
>In some cases, multi-homed end-sites may wish to have those /32s advertised
>into the global routing system. If, on the other hand, those end sites were
>to transition to ipv6, they would instead obtain "PI" /48s and advertise
>those into the global routing system. How is the former any worse than the

For multi-homed sites, none.  For the vast majority of singly-homed
end locations, the PA-based sites are all going to aggregate nicely
whereas all those /32's are going to come from wherever someone
can find a single unique address.  No ISP is going to stop serving
clients for inability to get new blocks, and that means that in the IPv4
scenario you've got single /32's of indeterminate origin being routed
by every ISP as things move towards conclusion...


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