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

[Stanislav Kukla]

The same problem here. Upgraded from 16.04 to 16.10. When using network manager for connecting to cisco VPN (network-manager-openconnect), DNS does not work at all. Even public domains are not resolved. 
The only possibility for using VPN for me now is to manually add VPN's internal nameserver to /run/systemd/resolve/resolv.conf

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

Status in systemd:
  New
Status in systemd package in Ubuntu:
  Incomplete

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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