[RndTbl] programatically determine if DNS is down or blocked?

John Lange john at johnlange.ca
Wed Apr 6 15:49:19 CDT 2016

Maybe use:

Perl Net::DNS::Dig ?

Never tried it but it looks like it returns a lot of information similar to


On Wed, Apr 6, 2016 at 3:41 PM, Trevor Cordes <trevor at tecnopolis.ca> wrote:

> On 2016-04-06 Robert Keizer wrote:
> > Why don't you use dig+grep+sed in bash?
> Ya, that's one of the ideas (dig).  It looks like dig will
> differentiate between named down, vs blocked 53, vs simple invalid
> domain.
> I'm trying to see if there are other ways also, perhaps ones that don't
> require a fork.  And the dig will send out real queries to real
> servers, but I guess it will be tempered by the cache?  I'll have to
> test what dig does in the different failure modes when a) resolving a
> domain that isn't cached vs b) resolving one that is cached.
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John Lange
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