Using ovpn-dco

If OpenVPN has DCO support compiled-in it will always try to use ovpn-dco (note that Windows builds have DCO support always enabled), unless an incompatible option has been specified. In this case OpenVPN will fall-back to another driver (i.e. tun on Linux).

If using DCO is not desirable, it can be deactivated at startup by passing the --disable-dco option.