Re: [sig-policy] Need to understand logic behind assigning /64 IPv6 addr
- To: Usman Latif <osmankh at yahoo dot com>
- Subject: Re: [sig-policy] Need to understand logic behind assigning /64 IPv6 addresses
- From: Owen DeLong <owen at delong dot com>
- Date: Sun, 18 Sep 2011 03:53:52 -0700
- Cc: Skeeve Stevens <Skeeve at eintellego dot net>, "sig-policy at lists dot apnic dot net" <sig-policy at lists dot apnic dot net>
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On Sep 17, 2011, at 8:24 PM, Usman Latif wrote:
I don't think very many people are advocating giving such a small assignment to residential users. The smallest common
practice I am aware of is /60s and most providers are doing at least /56. I still think /48 is better.
The protocol was designed with stateless autoconf in mind. I'm not sure why you insist on ignoring this fact.
You need a bigger imagination.
It's really not about dense packing the hosts into the /64 and actually having 18 quintillion hosts on a subnet. Of course, nobody would do that, it exceeds the practical scaling limits of the layer 2 topology.
However, it means that you don't have to worry about counting hosts. Every network has enough numbers available for every host.
Yes… In other words, a /64 is too small for a home according to 6177. Admittedly, 6177 backed way off from the /48 recommendation for residential users, but, I believe that was caving to pressure from the IPv4-think crowd and not based on any real engineering data.
Stateless autoconfiguration and DHCPv6 are both valid address auto-assignment mechanisms in IPv6. Each has its strengths and weaknesses. Each has applications it is well suited for and applications it is not at all well suited to.