On Tue, 18 Sep 2012 18:18:28 -0400, William Herrin said:
In http://lists.arin.net/pipermail/arin-ppml/2010-September/018180.html I complained about mapping the full 32-bits of IPv4 address into an IPv6 prefix. You responded, "You say that like it's somehow a bad thing," and "I'm simply not seeing a problem."
Have you come around to my way of thinking that using 6RD with a full 32-bit IPv4 mapping is not such a hot idea?
They're not in contradiction - you want a /28 so you can do 6RD, ARIN should let you do that. You want a /28 so you can do a non-6RD network plan, you should be allowed to do that too. But you don't get to deploy 6RD, and then complain that you don't have enough bits left when you try to do a non-6RD design. Or you could be a bit smarter and realize that you probably only actually *need* to use 16 or 20 bits of address for 6RD mapping and leave yourself 16 or 12 for other uses. AS1312 has 2 /16s, so we only need to map 16 bits of address and one more to indicate which /16 it was and the rest can be implicit. Which of course still loses if you have more than a /8 or so, or if you have 1,495 little prefixes that are scattered all over the /0....