Unable to get AAAA for www.revk.uk from some of our servers

[Mark Andrews]

In message <001301d01f06$aa1c7180$fe555480$@iname.com>, "Frank Bulk" writes:
> I dumped the database of one failing server and found this entry:
> 
> ; authauthority
> ghs.l.google.com.       331     \-AAAA  ;-$NXRRSET
> ; l.google.com. SOA ns4.google.com. dns-admin.google.com. 1577084 900 900
> 1800 60
> ; authanswer
>                         289     A       74.125.201.121
> ;
> 
> What does the "\-AAAA   ;-$NXRRSET" mean?

It means that there is a negative cache entry for AAAA lookup.  The
SOA record that will be returned is in the comment.  For responses
from signed zones you will also see NSEC / NSEC3 records in the
comments as well as RRSIG.

NXRRSET (No Such RRset).
NXDOMAIN (No Such Domain).

> Working server shows this in the dump:
> ; authanswer
> ghs.l.google.com.       287     AAAA    2607:f8b0:4001:c08::79
> ;
> 
> Regards,
> 
> Frank Bulk
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org