DNS server in NM static ethernet config fails to configure in systemd-resolved

[Bernd Porr]

1)
root@dimension:/home/bp1# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Artful Aardvark (development branch)
Release: 17.10
Codename: artful
root@dimension:/home/bp1#
2)
systemd:
  Installed: 234-2ubuntu10
  Candidate: 234-2ubuntu10
  Version table:
 *** 234-2ubuntu10 500
        500 http://gb.archive.ubuntu.com/ubuntu artful/main amd64 Packages
        100 /var/lib/dpkg/status
3) DNS resolution
4) No DNS resolution from my configured DNS (in my case 192.168.1.1)
Workarounds:
Enable FallbackDNS=8.8.8.8 8.8.4.4 in resolved.conf
Or running dhclient

Fresh boot of Artful (static IP via network manager and DNS should be at 192.168.1.1):

bp1@dimension:~$ ifconfig
enp8s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
        inet 192.168.1.5 netmask 255.255.255.0 broadcast 192.168.1.255
        inet6 fe80::99f:fae5:1467:a576 prefixlen 64 scopeid 0x20<link>
        ether 00:1e:4f:e9:f1:c1 txqueuelen 1000 (Ethernet)
        RX packets 141 bytes 14707 (14.7 KB)
        RX errors 0 dropped 0 overruns 0 frame 0
        TX packets 234 bytes 29807 (29.8 KB)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
        device interrupt 16

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
        inet 127.0.0.1 netmask 255.0.0.0
        inet6 ::1 prefixlen 128 scopeid 0x10<host>
        loop txqueuelen 1000 (Local Loopback)
        RX packets 556 bytes 33758 (33.7 KB)
        RX errors 0 dropped 0 overruns 0 frame 0
        TX packets 556 bytes 33758 (33.7 KB)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

bp1@dimension:~$ ping www.dn.se
ping: www.dn.se: Name or service not known
bp1@dimension:~$ su
Password:
root@dimension:/home/bp1# systemd-resolve --status
Global
          DNSSEC NTA: 10.in-addr.arpa
                      16.172.in-addr.arpa
                      168.192.in-addr.arpa
                      17.172.in-addr.arpa
                      18.172.in-addr.arpa
                      19.172.in-addr.arpa
                      20.172.in-addr.arpa
                      21.172.in-addr.arpa
                      22.172.in-addr.arpa
                      23.172.in-addr.arpa
                      24.172.in-addr.arpa
                      25.172.in-addr.arpa
                      26.172.in-addr.arpa
                      27.172.in-addr.arpa
                      28.172.in-addr.arpa
                      29.172.in-addr.arpa
                      30.172.in-addr.arpa
                      31.172.in-addr.arpa
                      corp
                      d.f.ip6.arpa
                      home
                      internal
                      intranet
                      lan
                      local
                      private
                      test

Link 2 (enp8s0)
      Current Scopes: LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
root@dimension:/home/bp1# ping www.dn.se
ping: www.dn.se: Name or service not known
root@dimension:/home/bp1# nano /etc/systemd/resolved.conf
root@dimension:/home/bp1# cat /etc/systemd/resolved.conf
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See resolved.conf(5) for details

[Resolve]
#DNS=
FallbackDNS=8.8.8.8 8.8.4.4
#Domains=
#LLMNR=yes
#MulticastDNS=yes
#DNSSEC=no
#Cache=yes
#DNSStubListener=udp
root@dimension:/home/bp1# ps ax | grep systemd
  254 ? Ss 0:00 /lib/systemd/systemd-journald
  292 ? Ss 0:00 /lib/systemd/systemd-udevd
  573 ? Ssl 0:00 /lib/systemd/systemd-timesyncd
  585 ? Ss 0:00 /lib/systemd/systemd-networkd
  701 ? Ss 0:00 /lib/systemd/systemd-logind
  735 ? Ss 0:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
  844 ? Ss 0:00 /lib/systemd/systemd-resolved
 1138 ? Ss 0:00 /lib/systemd/systemd --user
 1219 ? Ss 0:00 /usr/bin/dbus-daemon --session --address=systemd: --nofork --nopidfile --systemd-activation
 1531 ? Ss 0:00 /lib/systemd/systemd --user
 1678 pts/0 S+ 0:00 grep --color=auto systemd
root@dimension:/home/bp1# kill -HUP 844
root@dimension:/home/bp1# ping www.dn.se
PING e12723.a.akamaiedge.net (23.217.10.201) 56(84) bytes of data.
64 bytes from a23-217-10-201.deploy.static.akamaitechnologies.com (23.217.10.201): icmp_seq=1 ttl=58 time=27.4 ms
^C
--- e12723.a.akamaiedge.net ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 27.478/27.478/27.478/0.000 ms

root@dimension:/home/bp1# systemd-resolve --status
Global
         DNS Servers: 8.8.8.8
                      8.8.4.4
          DNSSEC NTA: 10.in-addr.arpa
                      16.172.in-addr.arpa
                      168.192.in-addr.arpa
                      17.172.in-addr.arpa
                      18.172.in-addr.arpa
                      19.172.in-addr.arpa
                      20.172.in-addr.arpa
                      21.172.in-addr.arpa
                      22.172.in-addr.arpa
                      23.172.in-addr.arpa
                      24.172.in-addr.arpa
                      25.172.in-addr.arpa
                      26.172.in-addr.arpa
                      27.172.in-addr.arpa
                      28.172.in-addr.arpa
                      29.172.in-addr.arpa
                      30.172.in-addr.arpa
                      31.172.in-addr.arpa
                      corp
                      d.f.ip6.arpa
                      home
                      internal
                      intranet
                      lan
                      local
                      private
                      test

Link 2 (enp8s0)
      Current Scopes: LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no

[Dimitri John Ledkov (xnox)]

Fresh boot of Artful (static IP via network manager and DNS should be at 192.168.1.1) -> NetworkManager has integration with systemd-resolved and thus should pass DNS information to resolved.

Could you please show your NetworkManager configuration for the network in question?

[Bernd Porr (berndporr)]

bp1@dimension:~$ nmcli
enp8s0: connected to Ethernet connection 1
 "Broadcom Limited NetXtreme BCM5754 Gigabit Ethernet PCI Express (Precision T5400)"
 ethernet (tg3), 00:1E:4F:E9:F1:C1, hw, mtu 1500
 ip4 default
 inet4 192.168.1.5/24
 route4 169.254.0.0/16
 inet6 fe80::99f:fae5:1467:a576/64

lo: unmanaged
 "lo"
 loopback (unknown), 00:00:00:00:00:00, sw, mtu 65536

DNS configuration:
 servers: 192.168.1.1
 interface: enp8s0

[Bernd Porr (berndporr)]

Should also add that there is the same problem when I enable dhcp and let the network manager do dhcp.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Steve Langasek (vorlon)]

I have tested on artful here with a NetworkManager wired connection with static DNS and cannot reproduce the problem.