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.rabinov...@case.edu> > Date: Thursday 2021-01-28 at 17:01 > To: Hugo Salgado <hsalg...@nic.cl> > Cc: RIPE Atlas <ripe-atlas@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 > <hsalg...@nic.cl<mailto:hsalg...@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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