Without the patch for LP: #1668771 resolved caches the SERVFAIL answer. root@bionic:/home/multipass# host www.montemar.cl Host www.montemar.cl not found: 2(SERVFAIL) root@bionic:/home/multipass# journalctl -u systemd-resolved -f -- Logs begin at Fri 2019-07-26 13:10:01 -04. -- Jul 26 13:13:12 bionic systemd-resolved[3167]: Transaction 25942 for <www.montemar.cl IN A> scope dns on ens3/*. Jul 26 13:13:12 bionic systemd-resolved[3167]: Using feature level UDP for transaction 25942. Jul 26 13:13:12 bionic systemd-resolved[3167]: Sending query packet with id 25942. Jul 26 13:13:12 bionic systemd-resolved[3167]: Processing incoming packet on transaction 25942. (rcode=SERVFAIL) Jul 26 13:13:12 bionic systemd-resolved[3167]: Server returned error: SERVFAIL Jul 26 13:13:12 bionic systemd-resolved[3167]: Verified we get a response at feature level UDP from DNS server 10.91.4.1. Jul 26 13:13:12 bionic systemd-resolved[3167]: Added SERVFAIL cache entry for www.montemar.cl IN A 30s Jul 26 13:13:12 bionic systemd-resolved[3167]: Transaction 25942 for <www.montemar.cl IN A> on scope dns on ens3/* now complete with <rcode-failure> from network (unsigned). Jul 26 13:13:12 bionic systemd-resolved[3167]: Sending response packet with id 26821 on interface 1/AF_INET. Jul 26 13:13:12 bionic systemd-resolved[3167]: Freeing transaction 25942.
With the patch for LP: #1668771 resolved + setting Cache: 'no-negative' doesn't caches the SERVFAIL option root@bionic:/home/multipass# host www.montemar.cl Host www.montemar.cl not found: 2(SERVFAIL) root@bionic:/home/multipass# journalctl -u systemd-resolved -f -- Logs begin at Fri 2019-07-26 13:10:01 -04. -- Jul 26 13:13:40 bionic systemd-resolved[3199]: Transaction 48671 for <www.montemar.cl IN A> scope dns on ens3/*. Jul 26 13:13:40 bionic systemd-resolved[3199]: Using feature level UDP for transaction 48671. Jul 26 13:13:40 bionic systemd-resolved[3199]: Sending query packet with id 48671. Jul 26 13:13:40 bionic systemd-resolved[3199]: Processing incoming packet on transaction 48671. (rcode=SERVFAIL) Jul 26 13:13:40 bionic systemd-resolved[3199]: Server returned error: SERVFAIL Jul 26 13:13:40 bionic systemd-resolved[3199]: Verified we get a response at feature level UDP from DNS server 10.91.4.1. Jul 26 13:13:40 bionic systemd-resolved[3199]: Not caching negative entry for: www.montemar.cl IN A, cache mode set to no-negative Jul 26 13:13:40 bionic systemd-resolved[3199]: Transaction 48671 for <www.montemar.cl IN A> on scope dns on ens3/* now complete with <rcode-failure> from network (unsigned). Jul 26 13:13:40 bionic systemd-resolved[3199]: Sending response packet with id 25454 on interface 1/AF_INET. Jul 26 13:13:40 bionic systemd-resolved[3199]: Freeing transaction 48671. Marking this as verified and working. -- 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
