Without the patch for LP: #1668771 resolved caches the SERVFAIL answer on disco.
oot@disco:/home/multipass# host www.montemar.cl Host www.montemar.cl not found: 2(SERVFAIL) (reverse-i-search)`': ^C root@disco:/home/multipass# journalctl -u systemd-resolved -f -- Logs begin at Fri 2019-07-26 13:15:35 -04. -- Jul 26 13:17:56 disco systemd-resolved[3872]: Transaction 43091 for <www.montemar.cl IN A> scope dns on ens3/*. Jul 26 13:17:56 disco systemd-resolved[3872]: Using feature level UDP for transaction 43091. Jul 26 13:17:56 disco systemd-resolved[3872]: Sending query packet with id 43091. Jul 26 13:17:56 disco systemd-resolved[3872]: Processing incoming packet on transaction 43091 (rcode=SERVFAIL). Jul 26 13:17:56 disco systemd-resolved[3872]: Server returned error: SERVFAIL Jul 26 13:17:56 disco systemd-resolved[3872]: Verified we get a response at feature level UDP from DNS server 10.91.4.1. Jul 26 13:17:56 disco systemd-resolved[3872]: Added SERVFAIL cache entry for www.montemar.cl IN A 30s Jul 26 13:17:56 disco systemd-resolved[3872]: Transaction 43091 for <www.montemar.cl IN A> on scope dns on ens3/* now complete with <rcode-failure> from network (unsigned). Jul 26 13:17:56 disco systemd-resolved[3872]: Sending response packet with id 40433 on interface 1/AF_INET. Jul 26 13:17:56 disco systemd-resolved[3872]: Freeing transaction 43091. With the patch for LP: #1668771 resolved + setting Cache: 'no-negative' doesn't caches the SERVFAIL option on disco. Logs begin at Fri 2019-07-26 13:15:35 -04. -- Jul 26 13:18:21 disco systemd-resolved[3893]: Transaction 22380 for <www.montemar.cl IN A> scope dns on ens3/*. Jul 26 13:18:21 disco systemd-resolved[3893]: Using feature level UDP for transaction 22380. Jul 26 13:18:21 disco systemd-resolved[3893]: Sending query packet with id 22380. Jul 26 13:18:21 disco systemd-resolved[3893]: Processing incoming packet on transaction 22380 (rcode=SERVFAIL). Jul 26 13:18:21 disco systemd-resolved[3893]: Server returned error: SERVFAIL Jul 26 13:18:21 disco systemd-resolved[3893]: Verified we get a response at feature level UDP from DNS server 10.91.4.1. Jul 26 13:18:21 disco systemd-resolved[3893]: Not caching negative entry for: www.montemar.cl IN A, cache mode set to no-negative Jul 26 13:18:21 disco systemd-resolved[3893]: Transaction 22380 for <www.montemar.cl IN A> on scope dns on ens3/* now complete with <rcode-failure> from network (unsigned). Jul 26 13:18:21 disco systemd-resolved[3893]: Sending response packet with id 30418 on interface 1/AF_INET. Jul 26 13:18:21 disco systemd-resolved[3893]: Freeing transaction 22380. ** Tags removed: verification-needed verification-needed-bionic verification-needed-disco ** Tags added: verification-done verification-done-bionic verification-done-disco -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1668771 Title: [SRU] systemd-resolved negative caching for extended period of time To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1668771/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
