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

[Anders Kaseorg]

3421 seems like the opposite of this problem.  There, queries that
belong on the local network instead go to the domain-limited VPN
servers.  Here, queries that should go to the VPN servers (which in my
case are not domain-limited) instead go to the local servers.  Also,
here I am using NetworkManager, not systemd-networkd.

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

Status in systemd:
  Unknown
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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