[RndTbl] programatically determine if DNS is down or blocked?
john at johnlange.ca
Wed Apr 6 15:49:19 CDT 2016
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
> 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.
> Roundtable mailing list
> Roundtable at muug.mb.ca
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Roundtable