DNS "A" query for a single dot

[Barry Margolin]

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
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