DNS "A" query for a single dot
Barry Margolin
barmar at alum.mit.edu
Tue Mar 11 04:10:15 UTC 2008
In article <fr4vdl$2c7l$1 at sf1.isc.org>, Mark <anonymoususr at gmail.com>
wrote:
> Hello ,
>
> Does anybody knows what an "A" query for a dot (".") means?
"." is the root domain.
> Is it part of DNS and serve a special purpose?
> Is it a bug on the client making the query?
> Is it an indicative of a bot/worm making queries?
>
> I am parsing the DNS packet using the name server library (function
> ns_initparse) and some DNS packets have questions for "."
I think there are a number of domains that have MX records pointing to
the root, as a convention to prevent mail from being sent to the domain.
--
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***
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