[dhcwg] dhcpv6-24: use of DNS names in DUIDs

The document makes references to DNS names in two places:

> 9.3. Vendor-assigned unique ID based on Domain Name (VUID-DN)
> 
>    The vendor-assigned unique ID based on the domain name consists of a
>    two-octet value giving the length of the identifier, the value of the
>    identifier and the vendor's registered domain name.

I don't think VUID-DN format is needed and would suggest simply
removing it. 

Rational:

DNS names are NOT permanent identifiers. For example, registrars
can reclaim DNS names if the renewal fees are not paid, if there
disputes of trademark, etc. Thus, these may be less permanent than
appears.

Second, they don't seem to provide any additional
benefits/functionality compared with VUID-EN. In those DUIDs, an
enterprise number provides the global uniqueness. Enterprise numbers
were defined precisely for this purpose, are permanent, and are easy
to get.

> 8. Representation and use of domain names
> 
>    So that domain names may be encoded uniformly and compactly, a
>    domain name or a list of domain names is encoded using the technique
>    described in sections 3.1 and 4.1.4 of RFC1035 [12].  Section 4.1.4
>    of RFC1035 describes how more than one domain name can be represented
>    in a list of domain names.  For use in this specification, in a
>    list of domain names, the compression pointer (see section 4.1.4 of
>    RFC1035) refers to the offset within the list.

I don't think this needs to be in the base document. Nowhere does the
base spec use DNS names according to this format. Thus, there is
nothing to implement. Note that VUID-DN mentioned above doesn't use
this format (is that a bug?) -- it seems to use an ascii string
(which, BTW, is probably not really what is needed, given a future
with I18N DNS names).

When an option gets defined that encodes a DNS name, that is where the
above text needs to be specified.

Thomas

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