[atlas] Fwd: [mat-wg] Atlas: DNS TCP Errors

Hi John,

On 2017/03/14 14:49 , John wrote:
> feature request, when preforming DNS queries over TCP would it be
> possible for the probe to differentiate between a timeout and a TCP
> Reset.  Currently the result just records the following when it gets a
> reset[1].
> 
> `error.timeout: 5000`

I'll create a ticket for that. I have no idea about the ETA at the moment.

> A similar feature to record ICMP prohibited for udp queries would also
> be useful but likely much harder.

I wonder if the retry option would help here. The second send should get
an error from the kernel if the previous one resulted in an error ICMP.

Actually getting the ICMP is possibly too hard, but a send error may
help a bit. But it requires some experimenting to see if this approach
would work.

Philip