One more comment: I had a leftover IPv6 config on the server, which
basically ment it was enabled but not really used. After disabling it
(commenting out all "server-ipv6") everything works as it used to, just
without IPv6.

I've noticed now what I missed before, in syslog (again, parts removed):
Apr 18 09:42:10 msylw-imac NetworkManager[1152]: <info> IPv4 configuration:
Apr 18 09:42:10 msylw-imac NetworkManager[1152]: <info>   Forbid Default Route: 
yes
Apr 18 09:42:10 msylw-imac NetworkManager[1152]: <info> IPv6 configuration:
Apr 18 09:42:10 msylw-imac NetworkManager[1152]: <info>   Forbid Default Route: 
no

My guess is that the ipv6 config also prevented the "old" default dns from 
being used for ipv4. 
I have no idea whether it makes sense to have forbid default route for ipv4 but 
not for ipv6, and whether this should stay here or be considered configuration 
error.

BTW: I'm currently using kubuntu, and it lacks the dialog for
configuring ipv6 for openvpn. If this would be considered invalid
configuration then perhaps this has to be redirected as gui problem.

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https://bugs.launchpad.net/bugs/1304437

Title:
  After connecting to OpenVPN server the default DNS is no longer
  available

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