Public bug reported:
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
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1685606
Title:
systemd-resolv does not clear IPv6 DNS server entries after disconnect
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1685606/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
