проверить соединение vpn в классе достижимости

Question

Я хотел проверить, является ли соединение vpn или нет.

Я использую

kSCNetworkReachabilityFlagsTransientConnection - для обнаружения VPN.

@enum SCNetworkReachabilityFlags
    @discussion Flags that indicate whether the specified network
        nodename or address is reachable, whether a connection is
        required, and whether some user intervention may be required
        when establishing a connection.
    @constant kSCNetworkReachabilityFlagsTransientConnection
        This flag indicates that the specified nodename or address can
        be reached via a transient connection, such as PPP.
    @constant kSCNetworkReachabilityFlagsReachable
        This flag indicates that the specified nodename or address can
        be reached using the current network configuration.
    @constant kSCNetworkReachabilityFlagsConnectionRequired
        This flag indicates that the specified nodename or address can
        be reached using the current network configuration, but a
        connection must first be established.

        As an example, this status would be returned for a dialup
        connection that was not currently active, but could handle
        network traffic for the target system.
    @constant kSCNetworkReachabilityFlagsConnectionOnTraffic
        This flag indicates that the specified nodename or address can
        be reached using the current network configuration, but a
        connection must first be established.  Any traffic directed
        to the specified name or address will initiate the connection.

        Note: this flag was previously named kSCNetworkReachabilityFlagsConnectionAutomatic
    @constant kSCNetworkReachabilityFlagsInterventionRequired
        This flag indicates that the specified nodename or address can
        be reached using the current network configuration, but a
        connection must first be established.  In addition, some
        form of user intervention will be required to establish this
        connection, such as providing a password, an authentication
        token, etc.

        Note: At the present time, this flag will only be returned
        in the case where you have a dial-on-traffic configuration
        (ConnectionOnTraffic), where an attempt to connect has
        already been made, and where some error (e.g. no dial tone,
        no answer, bad password, ...) was encountered during the
        automatic connection attempt.  In this case the PPP controller
        will stop attempting to establish a connection until the user
        has intervened.
    @constant kSCNetworkReachabilityFlagsConnectionOnDemand
        This flag indicates that the specified nodename or address can
        be reached using the current network configuration, but a
        connection must first be established.
        The connection will be established "On Demand" by the
        CFSocketStream APIs.
        Other APIs will not establish the connection.
    @constant kSCNetworkReachabilityFlagsIsLocalAddress
        This flag indicates that the specified nodename or address
        is one associated with a network interface on the current
        system.
    @constant kSCNetworkReachabilityFlagsIsDirect
        This flag indicates that network traffic to the specified
        nodename or address will not go through a gateway, but is
        routed directly to one of the interfaces in the system.
    @constant kSCNetworkReachabilityFlagsIsWWAN
        This flag indicates that the specified nodename or address can
        be reached via an EDGE, GPRS, or other "cell" connection.

Это работает в большинстве бесплатных приложений VPN. Это хорошо для использования? или он не будет работать во всех типах VPN-подключений?