[atlas] dig +trace equivalency

All,

Stephane Bortzmeyer:
> On Sat, Nov 25, 2017 at 02:12:06PM +0900,
>  dikshie <dikshie at gmail.com> wrote 
>  a message of 11 lines which said:
> 
>> I use to use +trace option in dig command.
>> Is there any same function equivalency in Atlas's DNS measurement tool?
> 
> dig +trace is not very reliable, and does not work with all
> resolvers. And, no, I don't think there is an equivalent for the Atlas
> probes. It would require some resolver-like logic in the probe.

It is in principle possible to simulate resolver-like logic without
updating the probe. In fact, I worked on a team to do just that at a
RIPE Atlas Hackathon a couple years ago. You can see the results on
GitHub here:

https://github.com/shane-kerr/ripe-atlas-shrugd

This was just a hack, but the technique should be usable to do something
similar to "dig +trace".

Cheers,

--
Shane