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

[Nicholas Stommel]

Tim Shannon, from the comment about network-manager-openconnect-gnome, please use this updated patch to build the network manager. I added conditions for the cisco GRE and GRETAP link types, see https://en.wikipedia.org/wiki/Generic_Routing_Encapsulation and http://www.cisco.com/c/en/us/td/docs/security/security_management/cisco_security_manager/security_manager/4-4/user/guide/CSMUserGuide_wrapper/vpgredm.html#69194
so I think this might fix the issue connecting through network-manager-openconnect-gnome

Please build the network-manager with the following patch and see if DNS
leaks are fixed over cisco openconnect VPN links. Thanks!

** Patch added: "possible cisco network-manager-openconnect-fix"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1624317/+attachment/4890352/+files/resolved-vpn-dns-leak-fix.patch

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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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