The .by domain is kind of bonkers… Step 1: get nameservers for 103.by:
$ dig +noall +authority IN NS 103.by. @a.root-servers.net by. 172800 IN NS dns1.tld.becloudby.com. by. 172800 IN NS dns2.tld.becloudby.com. by. 172800 IN NS dns3.tld.becloudby.com. by. 172800 IN NS dns4.tld.becloudby.com. by. 172800 IN NS dns5.tld.becloudby.com. Step 2: get nameservers for becloudy.com: $ dig +noall +authority IN NS becloudby.com. @a.root-servers.net com. 172800 IN NS e.gtld-servers.net. com. 172800 IN NS b.gtld-servers.net. […] $ dig +noall +authority IN NS becloudby.com. @a.gtld-servers.net. becloudby.com. 172800 IN NS u1.hoster.by. becloudby.com. 172800 IN NS u2.hoster.by. Step 3: get nameservers for hoster.by $ dig +noall +authority IN NS hoster.by. @a.root-servers.net by. 172800 IN NS dns1.tld.becloudby.com. by. 172800 IN NS dns2.tld.becloudby.com. by. 172800 IN NS dns3.tld.becloudby.com. by. 172800 IN NS dns4.tld.becloudby.com. by. 172800 IN NS dns5.tld.becloudby.com. Step 4: get nameservers for becloudy.com: […] My guess is that it probably depends on the current state of the cache whether `named` is able to break out of the loop using the existing data or not. From the log, I can see that it’s hitting the SERVFAIL cache. You can disable the servfail caching with: ``servfail-ttl`` This sets the number of seconds to cache a SERVFAIL response due to DNSSEC validation failure or other general server failure. If set to ``0``, SERVFAIL caching is disabled. The SERVFAIL cache is not consulted if a query has the CD (Checking Disabled) bit set; this allows a query that failed due to DNSSEC validation to be retried without waiting for the SERVFAIL TTL to expire. The maximum value is ``30`` seconds; any higher value is silently reduced. The default is ``1`` second. And see if that helps. Ondrej -- Ondřej Surý (He/Him) ond...@isc.org My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours. > On 29. 3. 2022, at 16:02, Dzmitry Shykuts <dshyk...@gmail.com> wrote: > > Hello! Can anybody help me with periodic and critical for me SERVFAIL? Cannot > determine the source of the problem. > > I have Debian 11.3 and BIND9 9.16.27 on it. There was no such problem earlier. > > I do request: > > <<>> DiG 9.16.27-Debian <<>> 103.by +trace > ;; global options: +cmd > . 518377 IN NS e.root-servers.net. > . 518377 IN NS a.root-servers.net. > . 518377 IN NS h.root-servers.net. > . 518377 IN NS k.root-servers.net. > . 518377 IN NS b.root-servers.net. > . 518377 IN NS i.root-servers.net. > . 518377 IN NS j.root-servers.net. > . 518377 IN NS d.root-servers.net. > . 518377 IN NS c.root-servers.net. > . 518377 IN NS m.root-servers.net. > . 518377 IN NS f.root-servers.net. > . 518377 IN NS g.root-servers.net. > . 518377 IN NS l.root-servers.net. > . 518377 IN RRSIG NS 8 0 518400 20220411050000 20220329040000 9799 . > keszTJZg3TCzY3s4UyinKYe7VwZGGf/8kHoWzJ2Ab3n4ctBt8gtleqC0 > UZqIIjc9Ez9srWGGeNn2gRUtB65QvL99oX5gD5VI6h1SY81OC0HcBx2c > 80SZJ0s9qpNmkDDcp4EUNlgoheDkBAtB3MsIRIVA6T746gBthcVKLHxC > rpOy7ELdgDtHwtq8jL5QIFae6QlIGuO95nflzk31VoL/yhCxvpzIXEfq > QJlJQf21YJtAtYnY7vJJwuDVT20y/cj5W7PNxSkNLMoukqUXOeH/w2yB > 0yNkwbKLBZUkyrE5tQmlq5AnScofbT7ffOYB9o9ug39DgCTcqSeNZDYX 0Gekmg== > ;; Received 1137 bytes from 127.0.0.1#53(127.0.0.1) in 3 ms > > by. 172800 IN NS dns5.tld.becloudby.com. > by. 172800 IN NS dns2.tld.becloudby.com. > by. 172800 IN NS dns3.tld.becloudby.com. > by. 172800 IN NS dns4.tld.becloudby.com. > by. 172800 IN NS dns1.tld.becloudby.com. > by. 86400 IN DS 495 13 2 > 2D14284F8E47B53F839BD8068D438680B4B6C7A645769C9D89B47DF0 C5359B7B > by. 86400 IN RRSIG DS 8 1 86400 20220411050000 20220329040000 9799 . > IAk+oEOmuQVbb8RyxB9ML/GOwnLIaQdi0XMD8Y7san2AIx2lXeEZp3AV > fNgYQfTnVrGyi3ylXNkVmQXnqDdrPK8iJu6mKvmaI40sQwv8xDyx5Fnz > VaNHcY4+J3fQwSp+TrFxQuAlW3g3CFaUVNLk20V/TQUycVA75c+3TrW4 > IQJ1aua0lDsG1JS7BigHryUH9Vy8nSyuikYOIiML0BTTTqFQN7yk4AiE > 3gbYMuCsMHQKfAIXpswc/i1eGEW7yi5USnQqza4P2YEDrUhSUps5N2u5 > /UwdS1BsmW17WZRbfDudeL4y471jwKhYgCCycGI1whtToDA452nvDJL2 it6mlg== > couldn't get address for 'dns5.tld.becloudby.com': failure > couldn't get address for 'dns2.tld.becloudby.com': failure > couldn't get address for 'dns3.tld.becloudby.com': failure > couldn't get address for 'dns4.tld.becloudby.com': failure > couldn't get address for 'dns1.tld.becloudby.com': failure > dig: couldn't get address for 'dns5.tld.becloudby.com': no more > > Request SERVFAILed. When I do "rndc flush" several times, the problem has > gone for a while. After some time I get SERVFAIL again. Now I'm forwarding > the zone to Google DNS and there is no such problem. > > There is a some debug log from BIND of the problem: > > <named.txt>-- > Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from > this list > > ISC funds the development of this software with paid support subscriptions. > Contact us at https://www.isc.org/contact/ for more information. > > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
