How to track DNS resolution sources

Stephane Bortzmeyer bortzmeyer at
Wed Dec 3 17:02:01 UTC 2014

On Wed, Dec 03, 2014 at 11:32:08AM -0500,
 TR Shaw <tshaw at> wrote 
 a message of 20 lines which said:

> On the command line:
> host

Excuse me but it is useless. It tests only the local resolver (which
may be unpoisoned). It provides no details that could help to debug
the problem (such as the TTL).

More information about the NANOG mailing list