Public bug reported:

When using network-manager-openvpn, it always overwrite the default
route.  There is an option to prevent overwriting the default route, but
this also turns off addition of remote DNS information to dnsmasq.  This
behavior is wrong.

The OpenVPN server pushes an option, redirect-gateway, if it expects the
client to change its default route.  Although OpenVPN itself pays
attention to this, the information is lost in the interface to nm-
openvpn-service-openvpn-helper; instead, the helper always forwards the
route from route_vpn_gateway up the stack, and NetworkManager always
uses it.

Because of this, there is no correct way to configure a client to get
remote routes and DNS from the VPN, but not a default route.  This is
very problematic.

** Affects: network-manager-openvpn (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1031480

Title:
  network-manager-openvpn, default routes, and DNS issues

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