Isso funciona:
# use your own vpn gateway
my_vpn_gateway=your.vpn.gateway.com
# connect
sudo openvpn --mktun --dev tun1
sudo ifconfig tun1 up
# this command will prompt for credentials
sudo openconnect $my_vpn_gateway --interface=tun1
# disconnect
sudo ifconfig tun1 down
sudo openvpn --rmtun --dev tun1
Fonte: link