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

[Nicholas Stommel]

Anyone using Cisco PPTP/IPsec/openconnect VPN, please test the network
manager with the aforementioned patch or with the updated built .deb
provided here. The updated patch should address more types of VPN links.
Thanks!

** Attachment added: "updated patched .deb packaged network-manager for easy testing"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1624317/+attachment/4890421/+files/network-manager_1.4.4-1ubuntu3_amd64.deb

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

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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