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 latter?
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... /John