6 Apr
2016
6 Apr
'16
8:41 p.m.
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.