what does dig +trace do?

Tom Schmitt TomSchmitt at gmx.de
Tue Aug 30 11:56:59 UTC 2011


I have a question: What does dig +trace exactly do?

The reason for my question is:
I have a internal-only DNS in our company with my own root-zone. And normaly all things are fine. But when there is an issue I would like to analyze with dig +trace, the command fails.

If I do dig +trace example.com

I get something like this:

; <<>> DiG 9.8.0-P4 <<>> +trace example.com
;; global options: +cmd
.                       10800   IN      NS      root1.
.                       10800   IN      NS      root2.
.                       10800   IN      NS      root3.
.                       10800   IN      NS      root4.
;; Received 159 bytes from in 1 ms

;; connection timed out; no servers could be reached

I don't understand why there is a timeout. Next zone on the trace should be the com. domain which is hosted on the same servers as the rootzone.

I don't see any DNS-problems at all, only the +trace-option is behaving weird. Can anybode tell me why? What does this option what normal DNS queries don't do?


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