Mark.Andrews;
>>If the case is too difficult to understand, just consider a
>>case of "vix.net" with just a single AAAA and no A glue
>>returned. Then, IPv4 only host is at a loss.
> No. It just asks the parent the missing glue records
> individually. In this case for ?.gtld-servers.net/A records
> from the root servers.
>
> The only time it will loose is when the NS RRset is too big
> to even allow the requested glue RRset to be added
> preferentially to the additional section.
No. In general, clients can not know which nameserver needs
glues and to which nameserver to ask. If a delegation loop
involves multiple zones, clients have no reason to ask, for
example, a "com." zone nameserver addresses of nameservers of
zones under "edu."
> Older parent servers that promote glue to answer don't even
> have this problem.
Glue is glue.
Glue information should be answered only as glue.
DNS works, if a child zone nameserver can be contacted at an
address of a nameserver, which means most of the glue
information can be incorrect.
On the other hand, DNS answers are expected to be authoritative
one or copy of it.
Masataka Ohta
.
dnsop resources:_____________________________________________________
web user interface: http://darkwing.uoregon.edu/~llynch/dnsop.html
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