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** Changed in: network-manager (Ubuntu) Importance: Undecided => Low -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1685606 Title: systemd-resolv does not clear IPv6 DNS server entries after disconnect Status in network-manager package in Ubuntu: New Bug description: ii systemd 232-21ubuntu3 amd64 system and service manager ii network-manager 1.4.4-1ubuntu3 amd64 network management framework (daemon and userspace tools) Problem description: 1) When connected to a wired network that supports IPv4 and IPv6 with DNS via DHCP 'systemd-resolve --status' reports: DNS Servers: 10.10.10.1 fd00::c225:6ff:fe4e:1582 and nmcli (nmcli dev show |grep DNS) reports: IP4.DNS[1]: 10.10.10.1 IP6.DNS[1]: fd00::c225:6ff:fe4e:1582 2) After disconnecting this wired network interface it still reports: DNS Servers: fd00::c225:6ff:fe4e:1582 but nmcli does not report any DNS server, as expected. 3) After reconnecting to the same wired network, but after changing the IPv4 connection preferences from 'Method: Automatic (DHCP)' to Method: Automatic (DHCP) address only', and for IPv6 from 'Method: Automatic' to 'Method: Automatic, addresses only', 'systemd-resolve --status' still reports: DNS Servers: fd00::c225:6ff:fe4e:1582 and nmcli still does not report any DNS serv, as expected. I Have checked with tshark that, although no DNS server should be queried, systemd still did on the IPv6 DNS address (and successfully resolved names and addresses). ---some extra testing--- 4) After disconnecting this wired network interface it still reports: DNS Servers: fd00::c225:6ff:fe4e:1582 but nmcli does not report any DNS server, as expected. 5) Connect to a WireLess IPv4 only Network (MiFi) 'systemd-resolve --status' reports: DNS Servers: 192.168.8.1 and nmcli (nmcli dev show |grep DNS) reports: IP4.DNS[1]: 192.168.8.1 Both as expected 6) Network disconnect. 'systemd-resolve --status' reports: DNS Servers: 8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844 (these are FallbackDNS hostd mentioned in /etc/systemd/resolved.conf) and nmcli (nmcli dev show |grep DNS) does not report anything as expected. 7) Reconnect to wired network with IPv4 and IPv6 WITHOUT DNS servers via DHCP (Situation 3) DNS Servers: 8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844 and nmcli (nmcli dev show |grep DNS) does not report anything as expected. 8) Network disconnect: DNS Servers: 8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844 and nmcli (nmcli dev show |grep DNS) does not report anything as expected. 9) Connect to a wired network that supports IPv4 and IPv6 with DNS via DHCP (Situation 1) DNS Servers: 10.10.10.1 fd00::c225:6ff:fe4e:1582 and nmcli (nmcli dev show |grep DNS) reports: IP4.DNS[1]: 10.10.10.1 IP6.DNS[1]: fd00::c225:6ff:fe4e:1582 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1685606/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
