A while ago I wrote about IPv6 addressing challenges some ISPs face and recommended what I thought was agreed-upon practice of giving residential customers a /64 or a /56. Not long after, I received an e-mail from an IPv6 guru saying:
[Worse] is when people start claiming to have expertise in IPv6 and promulgate this idea of residential /56s and /64s as immutable fact. The reality is that it is becoming more and more apparent that /56s and especially /64s to residential customers are going to be harmful to future innovation in IPv6.
I can’t possibly track all the emerging technologies in the world and I am delighted when people point out my weak spots (as Petr Lapukhov, Dmitri Kalintsev and a few others are doing on a regular basis) as that’s a wonderful opportunity to learn something new, so I asked about the reasons why someone might want to give a residential user a /48 ... and never got a reply.
Still perplexed, I asked the same question at the Slovenian IPv6 summit’s roundtable with Daniel Karrenberg and Patrik Fältström ... and figured out that while it’s still quite possible I’m totally ignorant, at least I'm in a very respectable company.
As I’m running another session of the Building IPv6 Service Provider Core webinar next week (register here or buy a recording) and it includes a short section on IPv6 addressing best practices, please help me out: if you think there are good reasons to give residential users /48s, write a comment.