[dns-operations] Odd queries from win2k3 box with MSDNS and IPv6

Mark Andrews marka at isc.org
Wed Jun 22 22:17:17 UTC 2011

In message <4E021536.4030106 at 2mbit.com>, Brielle Bruns writes:
> On 6/22/11 10:00 AM, Jeroen Massar wrote:
> > On 2011-06-22 17:31 , Brielle Bruns wrote:
> >> Hello All,
> >>
> >> I asked this question on another list, but got no answer, so I figured
> >> I'd try here.
> >>
> >>
> >> We're seeing alot of weird A record queries from a MS DNS server on
> >> Win2k3 (yes, I know, it wasn't my choice to run these).  For example,
> >>
> >>
> >> ::1.somedomain.com
> >
> > What is the record type this is being asked for? Also, you might want to
> > index a little bit what tools are running on the host and check if the
> > hosts file in %WINDOWS%\system32\drivers\etc\hosts contains the ::1 or not.
> Thanks Jeroen.
> Its looking for A records - only noticed it while doing a protocol dump 
> trying to figure out why stats on two recursors for query failures was 
> so high.
> Hosts file ended up being clean, nothing there relating to v6.
> However, the machine in question is running BackupExec and the Meinberg 
> NTP server.  I'm going to take the server down for a little bit after 
> hours and try and figure out if its one of those two.
> Given that MS's own services support ipv6 even if their console snapins 
> and GUIs don't, I'm inclined to not think its SQL server or another MS 
> service.

Some piece of software that is not IPv6 aware will have "::1" in
the host field of its configuration.   Search the registry for
"::1".  That should give you some candidates to check.  Otherwise
it is a full disk search.

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org

More information about the dns-operations mailing list