OpenVPN client works very well on Windows 7 machines. However, its Windows 10 and Linux executables are lacking full functionality. Thus, these lines are required to workaround this handicap. 
 
# Windows 10 and Ubuntu
script-security 2
dhcp-option DNS 192.168.20.1
dhcp-option DNS 168.168.10.1
dhcp-option DOMAIN kimconnect.com
 
# Only on ubuntu client, ad the following directives:
up /etc/openvpn/update-resolv-conf
down /etc/openvpn/update-resolv-conf