Hi, Since we upgraded to pdns-recursor 4.6 we sometimes experience some weird behaviour with queries via pdns-recursor.
Sometimes, when a previously queried record expires through it's TTL, the recursor does not provide an answer anymore, until it's restarted. Unfortunately I am not able to reproduce this. It happens occasionally. When it happens, we see this: Faulty server: dig @ns1 riecis.nl A ; <<>> DiG 9.11.36-RedHat-9.11.36-3.el8 <<>> @ns1 riecis.nl A ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27148 ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;riecis.nl. IN A ;; AUTHORITY SECTION: riecis.nl. 2828 IN SOA ns1.minvenj.nl. hostmaster.solvinity.com. 2022010301 1800 300 604800 3600 ;; Query time: 2 msec ;; SERVER: xxx.xxx.xxx.xxx#53(xxx.xxx.xxx.xxx) ;; WHEN: Tue Sep 20 12:16:55 CEST 2022 ;; MSG SIZE rcvd: 110 other server: dig @ns2 riecis.nl A ; <<>> DiG 9.11.36-RedHat-9.11.36-3.el8 <<>> @ns2 riecis.nl A ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61517 ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;riecis.nl. IN A ;; ANSWER SECTION: riecis.nl. 224 IN A 159.46.204.40 ;; Query time: 1 msec ;; SERVER: xxx.xxx.xxx.xxx#53(xxx.xxx.xxx.xxx) ;; WHEN: Tue Sep 20 12:17:03 CEST 2022 ;; MSG SIZE rcvd: 54 We have a fairly simple configuration, just on what address and port to listen on, to use the same address for outgoing queries, en a short li st of addresses that are allowed to query. I have confirmed this problem upto and including version 4.6.3 Anyone an idea on how to approach this matter? Regards
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