cramer
join:2007-04-10
Raleigh, NC
kudos:5 Reviews:
 ·AT&T Southeast
| reply to mrdon213
That may be true for allocations from a regional registry, but there are no such "laws" requiring ISPs hand out such large blocks to customers -- esp. residential customers. A /64 is the smallest block they can give a network without breaking a basic part of IPv6 (SLAAC -- StateLess Address AutoConfiguration.) [as stupid as it is, millions of people will be (are) using it.]
The Comcast testing has had a great deal of debate. While a /60 (16 /64 networks) would be more than enough for all but the most complex "home" network, hardware routing isn't nibble aligned. So /56 (256 /64's) will likely be the path for those who need more than one LAN.
Handing out /48's to every grandmother with a DSL line is such a horrific mismanagement of space, in a few years we'd be back in the same boat we're trying to get out of today. A /48 is 65536 /64 networks. I could assign a /64 to every ethernet port in my house and still not use 0.1% of that much space -- and I'm counting every switch port, broken crap, stuff I've not used in years (and likely never will), and a lot of stuff that will never have IPv6 capability. Further, a /48 minimum would only increase the available internet by a factor of 65,536 (2^16); given how quickly we're using IPv4, the inherent inefficiencies of networking, and the pervasive it's-so-huge-we'll-never-use-it-up attitude, we'll need to have IPv6++ in committee in about 2 years. |
