North American Network Operators Group

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Re: Aggregation for IPv4-compatible IPv6 address space

  • From: Joe Abley
  • Date: Mon Feb 04 12:19:59 2008

On 4-Feb-2008, at 00:19, Scott Morris wrote:

You mean do you have to express it in hex?

There are two related things here: (a) the ability to represent a 32- bit word in an IPv6 address in the form of a dotted-quad, and (b) the legitimacy of an IPv6 address of the form ::A.B.C.D, where A.B.C.D is an IPv4 address.

(a) is a question about the presentation of IPv6 addresses. (b) is a question about the construction of IPv6 addresses to be used in packet headers.

I believe (a) is still allowed. However, (b) is not allowed. Since (b) is not allowed, (a) is arguably not very useful.