I got a connection with a VPN. I use Forticlient VPN SSL.
When I use my mac, I connect normally to the VPN and then go to somesiteinmyDNS/mythings and works perfectly fine.
However, when I connect with the same parameters using Ubuntu 16.04, the DNS won't work. The connection is fine but the DNS is not working.
I am using Forticlient SSLVPN 4.4.2333-1 64bit in Ubuntu.