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

[Martin Pitt]

This matches https://github.com/systemd/systemd/issues/3421 very closely
(I've worked on this a bit, but it got stalled, sorry). I think that is
the exact symptom you are seeing, can you confirm?

** Bug watch added: github.com/systemd/systemd/issues #3421
   https://github.com/systemd/systemd/issues/3421

** Also affects: systemd via
   https://github.com/systemd/systemd/issues/3421
   Importance: Unknown
       Status: Unknown

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1624317

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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