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

[Nicholas Stommel]

Huh. No, actually my patch DID work. See the line under vpn0 that says  
DNS Domain: ~.
So the correct bus call was made and all dns queries SHOULD be directed to the link-specified listed DNS servers. Your problem actually appears to be that there are no link-specified dns servers.
See the line that says
DNS Servers: <dns server 1> <dns server 1>
Please try manually specifying the correct DNS servers in the network-manager-openconnect gui settings. That should fix your problem I believe.

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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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