OpenVPN doesn't respect dns servers in settings

[CrazySky]

Hello! After upgrading to Ubuntu 18.10 OpenVPN doesn't respect dns servers in settings. It trying to resolve internal host with default DNS server except resolving with dns servers from connection settings. On Ubuntu 18.04 all works fine

1) 18.10
2) 1.8.6-1ubuntu1
3) OpenVPN uses DNS servers for resolving from connection settings
4) Resolving used by default DNS server

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: network-manager-openvpn 1.8.6-1ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 22 19:46:17 2018
InstallationDate: Installed on 2018-09-24 (28 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: network-manager-openvpn
UpgradeStatus: Upgraded to cosmic on 2018-10-22 (0 days ago)

[Launchpad Janitor (janitor)]

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

[Sebastien Bacher (seb128)]

Thank you for your bug report. What's the output of "systemd-resolve --status"?

The behaviour change could be a side effect of the fix for bug #1754671

[CrazySky (makarovdenis11)]

The output of systemd-resolve in attachment.

> The behaviour change could be a side effect of the fix for bug #1754671

Before update to Cosmic in Bionic everything works fine

[Sebastien Bacher (seb128)]

Could you give some details on your VPN config and on the DNS server you expect to be used?

[CrazySky (makarovdenis11)]

The vpn connection config created by network-manager-openvpn in attachment. I changed some values such as remote host name.

As you can see in IPv4 I used internal DNS. I can resolve internal dns names with this server via dig utility but OpenVPN doesn't resolve internal host names

[Launchpad Janitor (janitor)]

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

[Abel Boldú (aboldu)]

This is affecting users of dappnode.io platform when connecting from Ubuntu.
The DNS server pushed by OpenVPN server is not being added to clients.
A temporary fix can be applied, see https://askubuntu.com/questions/1032476/ubuntu-18-04-no-dns-resolution-when-connected-to-openvpn, but it's not very convenient for users.

Can this settings be pushed to systemd-resolved ?

[Bart (dmitriy-murzin)]

Some problem on Ubuntu 21.10
Im create OpenVPN connection in Setting/Network, set "Use this connection only for resources on its network" and DNS not working( Im manual set dns and it not working(

[- (nicoforce)]

Same issue on Ubuntu 23.04, as described by https://bugs.launchpad.net/ubuntu/+source/network-manager-openvpn/+bug/1799262/comments/9