IPv6 Netowrk Device Numbering BP

Thu Nov 1 19:28:05 UTC 2012

On Nov 1, 2012, at 10:43 , Chip Marshall <chip at 2bithacker.net> wrote:

> On 01-Nov-2012, Owen DeLong <owen at delong.com> sent:
>> The only exceptions to this parsing would be if someone handed
>> you a textual representation of an IPv4 mapped address
>> (::ffff:192.0.2.50), which essentially represents the partial
>> decimal format Masataka is requesting.
> 
> I might be missing something here, but isn't that format already
> valid for any IPv6 address, not just the special v4-in-v6
> representation?
> 
>>>> import socket
>>>> p = '2001:abcd::192.16.10.10'
>>>> n = socket.inet_pton(socket.AF_INET6, p)
>>>> socket.inet_ntop(socket.AF_INET6, n)
> '2001:abcd::c010:a0a'
> 
> Or is the issue just the ntop part not giving you back the
> decimalized string?

That's not a problem and I certainly wouldn't expect it to do so.

I guess the silly notation is more widely supported than I thought, but, IMHO, it's a kind of poor choice of syntax outside of the limited use of displaying IPv4-mapped addresses for dual-stack socket connections displaying IPv4 connections in IPv6 format.

Owen