dig @server foobar +trace +recurse
anne at encs.concordia.ca
Thu Jul 9 00:54:05 UTC 2015
Mark Andrews <marka at isc.org> responds to my suggestion:
>> [...] the "+trace"
>> option essentially overrides the @server specification, except for
>> the initial query for the root zone nameservers. [...]
>> Is my understanding correct?
>> If it is, it might be helpful to add a quick note to the "dig"
>> manpage, perhaps under "SIMPLE USAGE", "server", something like:
> Given +trace isn't "simple usage" (dig @server name type), why would
> one say that in the simple usage section?
Fair enough, and well taken; I can modify my suggestion.
> +trace states that it is
> going to talk to each server in turn.
Very true, and very painfully obvious in retrospect, but
while I was in the throes of trying to figure out my problem,
this managed to somehow escape me for quite a while. It would
still be nice to clarify it to avoid other people having the
How about this:
> Toggle tracing of the delegation path from the root name servers
> for the name being looked up. Tracing is disabled by default. When
> tracing is enabled, dig makes iterative queries to resolve the name
> being looked up. It will follow referrals from the root servers,
> showing the answer from each server that was used to resolve the
If @server is also specified, it affects only the
initial query for the root zone name servers.
> +dnssec is also set when +trace is set to better emulate the
> default queries from a nameserver.
Ms. Anne Bennett, Senior Sysadmin, ENCS, Concordia University, Montreal H3G 1M8
anne at encs.concordia.ca +1 514 848-2424 x2285
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