On Tue, 25 Jan 2011, Max Pierson wrote:
From the provider perspective, what is the prefix-length that most are accepting to be injected into your tables?? 2 or so years ago, I read where someone stated that they were told by ATT that they weren't planning on accepting anything smaller than a /32. So what if I get my shiny new /48 from ARIN and am already multi-homed??? Does ATT not want my business (which they wouldn't get if the first place, but for argument sake, yes, I chose to pick on ATT, sorry if I offended anyone :) I already see /40's /48's ,etc in the v6 table, so some folks are allowing /48 and smaller, so what is the new /24 in v6?
From what I've seen, both in terms of policy and practice is that most people are considering /48 to be 'the new /24'. A number of providers haven't published their v6 policies yet (at least in any place that's easy to find), but it looks like based on policy alone, NTT and Verizon will accept /48s.
Also, I don't know that the number of v6 prefixes will get completely out of control for a while. Many of the bigger consumers of v4 space are getting (or have gotten) initial v6 assignments that are large enough to satisfy their space needs for some time, so the number of v6 prefixes being announced to provide connectivity to a given number of ISP customers should actually go down somewhat. For example, Comcast has several /8s of v4 space, and they are announcing a /29 into the global v6 table at the moment. That could certainly change as they ramp up their deployment of v6, but I still think the number of v6 prefixes compared to v4 will be net-negative for a long time. jms