[atlas] querying the config

Hi Grzegorz. As far as I know, the dst_addr have the destination IP
address of the packet that the probe sent for a DNS measurement. So
if used the "use_probe_resolver:true" setting, it should be the
"frontend" resolver in your characterization. One of the resolvers
configured in probe's /etc/resolv.conf.

Regards,

Hugo

On 10:51 03/02, Ponikierski, Grzegorz wrote:
> It's important to notice that whoami.ds.akahelp.net will give you backend IP of resolver (IP used to communicate with authoritative name server). If somebody needs frontend IP then this query won't help.
> 
> Hugo or Robert, can you tell which IP (frontend or backend) we will get from dst_addr field?
> 
> Regards,
> Grzegorz
> 
> From: Michael Rabinovich <michael.rabinovich at case.edu>
> Date: Thursday 2021-01-28 at 17:01
> To: Hugo Salgado <hsalgado at nic.cl>
> Cc: RIPE Atlas <ripe-atlas at ripe.net>
> Subject: Re: [atlas] querying the config
> 
> Hi Randy,
> 
> In addition, whether it's the configuration or the IP address used by the probe for a query as Hugo suggested, this would only give you the entry point into the resolution path (and sometimes will be a private IP address of a simple forwarder).  But you can query for TXT record for whoami.ds.akahelp.net, which will return you the IP address of the egress resolver.
> 
> Misha
> 
> 
> On Jan 27, 2021, at 4:03 PM, Hugo Salgado <hsalgado at nic.cl<mailto:hsalgado at nic.cl>> wrote:
> 
> Hi Randy. I don't know if you can check the config, but if you launch
> a DNS measurement taking care to define use_probe_resolver:true, then
> in the dst_addr field of the results you will have the IP that it used
> as the resolver.
> 
> Hugo
> 
> On 12:23 27/01, Randy Bush wrote:
> howdy
> 
> so i wanted info about a probe's config, specifically what dns
> resolver(s) it is using.  i could not figure out how to do this.
> assuming it was a lack of clueons, i asked a friend with far deeper
> atlas fu.  they said such queries are not available.  really?
> 
> [ yes we have bright ideas on how to discover this indirectly by
>   mining past data ]
> 
> but really?
> 
> randy
> 
> 
> 
> 
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