Aggregation for IPv4-compatible IPv6 address space

Mon Feb 4 17:10:45 UTC 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.

Joe