// The following code only works on windows
 // On linux please use "ip" and "ifconfig" in the terminal for createing and enumerating all network interfaces
 // ip tuntap add dev tun0 mode tun
 // On windows you MUST install 'TAP-Windows Adapter V9' before execute the code
 List<TunTapDeviceInfo> DeviceList  = GetTapGuidList("tap0901");
 
 //TunTapDeviceInfo is a kind of structure defined as follow
 /*
     public struct TunTapDeviceInfo
        {
            public string Name;
            public string Guid;
            public TunTapDeviceInfo(string n, string g)
            {
                Name = n;
                Guid = g;
            }
        }
 */

 // On linux please set the dInfo to tun name. like "tun0" "tap0" ect.
 // On windows please set the dInfo to tun guid. like "{xxxxx-xxxxx-xxxx}".
    String dInfo; 
    TunTapDevice Device = New TunTapDevice(dInfo);
 // After this you will successfully create and initial a TUN/TAP device except the name or guid does not exist or the divice was occupied by other process. 

 // The following code only works on windows
 // On linux please use "ifconfig" or "ip" in the terminal.
 // ifconfig tun0 x.x.x.x netmask x.x.x.x up
 // 

 Device.ConfigTun(IPAddress.Parse("LOC_IP"), IPAddress.Parse("REM_IP"), IPAddress.Parse("NET_MASK"));
 Device.SetConnectionState(ConnectionStatus.Connected);

 Device.CreateDeviceIOStream(1500);
 FileStream DeviceIOStream = Device.TunTapDeviceIOStream;