Comment 59 for bug 1211110

I have the same problem. After establishing the connection I can ping all IP's, even the DNS server in the VPN network. But DNS resolve for servers in the VPN network does not work. I have even set the DNS servers IP and the domains to resolve in the network managers VPN configuration (in IPv4 settings) and set it to addresses only. It is still not resolving any VPN network addresses. Global addresses are resolved.

That was working in older versions of Ubuntu. I cannot tell when this was broken because I do not regularily use VPN, but the configuration was there and working in some previous release. I have upgraded this machine now for quite some years. Now in 16.04 it is broken. On a Windows machine that I tested it is still working.