[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS

[Nicholas Stommel]

I can confirm this works for multiple vpn connections and after wakeup from system suspend on Ubuntu 17.04. I encourage you to install the patched .deb or follow the instructions to build it from source and see for yourself. I'm honestly so glad this fixes dns leaks for using openvpn through the network manager gui on Ubuntu that I'm switching my primary machine to 17.04. :)
Please let me know if this resolves your problems with DNS leaks using a vpn via the network manager.

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Title:
  systemd-resolved breaks VPN with split-horizon DNS

Status in systemd:
  New
Status in network-manager package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  I use a VPN configured with network-manager-openconnect-gnome in which
  a split-horizon DNS setup assigns different addresses to some names
  inside the remote network than the addresses seen for those names from
  outside the remote network.  However, systemd-resolved often decides
  to ignore the VPN’s DNS servers and use the local network’s DNS
  servers to resolve names (whether in the remote domain or not),
  breaking the split-horizon DNS.

  This related bug, reported by Lennart Poettering himself, was closed with the current Fedora release at the time reaching EOL:
  https://bugzilla.redhat.com/show_bug.cgi?id=1151544

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