I found that http://community.nethserver.org/t/shorewall-block-openvpn-traffic-out/6075/4 is not just similar, but exactly my problem. I will pick up your suggestion there.
I found that http://community.nethserver.org/t/shorewall-block-openvpn-traffic-out/6075/4 is not just similar, but exactly my problem. I will pick up your suggestion there.