Thanks Winfried and Brian for the anwers. This appears to be a PDNS recursor property that cannot be configured by configuration. I understand that repeated query is another burden for an overloaded authoritative server, but an unsatisfied client will still query again.
Mira Dne 18. 09. 20 v 17:42 Winfried Angele napsal(a): > Hi Mira, > > I think if a Resolver retries on possibly overloaded or attacked > authoritative DNS servers, it gets even worse for them. So I'd > recommend to try to contact the people in charge for that domain and > try to convince them to solve the problem on their side. And again, > the Recursor tries on each Nameservers address listed in the NS RRset. > So it does retries, but not on the same address. That means, in your > case, all DNS servers of that domain are overloaded or broken or attacked. > > Winfried > > > Am 18. September 2020 16:05:04 MESZ schrieb Mira Krejci <kre...@i3.cz>: > > > Hi Winfried, > > thank you for your reply. > If it's a feature and can't be changed, I have a big problem that > I'll have to solve by changing the software to another. > For example, Bind asks more than once if answer does not come. > Users are angry that DNS resolving does not work for them (of > course, it is to blame for authoritative servers of a specific > domain). > But I have to solve it somehow. > > Thanks. > Mira > > Dne 18. 09. 20 v 15:34 Winfried Angele napsal(a): >> Hi Mira, >> >> Yes the Recursor does no retry on *this* auth. But it tries on >> the other nameservers from the NS RR set. IPv4 and IPv6. So if >> you have only one auth, Recursor tries two times, IPv4 and IPv6 >> if available. >> >> Winfried >> >> >> >> Am 18. September 2020 14:47:49 MESZ schrieb Mira Krejci via >> Pdns-users <pdns-users@mailman.powerdns.com>: >> >> Hi, >> >> I have a problem that I can't force the pdns recursor to query the >> authoritative servers repeatedly if they do not answer. Recursor >> tries >> the query only once and then return an error (SERVFAIL) to the >> client. >> This is very problematic when the authoritative server is overloaded >> or >> there are some problems on the network. I didn't find any way in the >> configuration to change it. >> >> Server version: 4.2.2-1 (from EPEL repo on CentOS 8) >> >> Can anyone help? >> Thanks. >> >> Mira >> >> ------------------------------------------------------------------------ >> Pdns-users mailing list >> Pdns-users@mailman.powerdns.com >> https://mailman.powerdns.com/mailman/listinfo/pdns-users >> >
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