问题
I have a c# peer-2-peer project where my application should configure UPnP in users devices to open a port and listen to UDP datagrams , I used NATUPnP.dll Com assemply to map a new Endpoints as the following :
NATUPNPLib.UPnPNATClass upnpnat = new NATUPNPLib.UPnPNATClass();
NATUPNPLib.IStaticPortMappingCollection mappings = upnpnat.StaticPortMappingCollection;
mappings.Add(20000, "UDP", 20000, "192.168.8.102", true, "Local Web Server");
foreach (NATUPNPLib.IStaticPortMapping portMapping in mappings)
{
Console.WriteLine(portMapping.Description); //gives me "Local Web Server"
Console.WriteLine(portMapping.ExternalIPAddress); // gives me "10.178.196.123"
Console.WriteLine(portMapping.Enabled); // gives me "True"
}
Console.ReadKey();
after this I write a simple UDP listener with a simple UDP client to test whether I succeed on mapping new End points ( port forwarding it) and the code for Listener was :
public static int Main()
{
bool done = false;
UdpClient listener = new UdpClient(listenPort);
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, listenPort);
string received_data;
byte[] receive_byte_array;
try
{
while (!done)
{
Console.WriteLine("Waiting for broadcast");
receive_byte_array = listener.Receive(ref groupEP);
Console.WriteLine("Received a broadcast from {0}", groupEP.ToString());
received_data = Encoding.ASCII.GetString(receive_byte_array, 0, receive_byte_array.Length);
Console.WriteLine("data follows \n{0}\n\n", received_data);
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
listener.Close();
return 0;
}
and the Client :
UdpClient udpSender = new UdpClient();
IPEndPoint localServerGateway = new IPEndPoint(IPAddress.Parse("10.178.196.123"), 20000);
string message = "testmessage";
byte[] messageBytes = Encoding.ASCII.GetBytes(message);
try
{
udpSender.Send(messageBytes, messageBytes.Length, localServerGateway);
}
catch (Exception error)
{
Console.WriteLine("Error while sending message: " + error.ToString());
}
udpSender.Close();
when I send a test message to the loopback address (127.0.0.1) the server console show me this message and every thing works fine , but when I send a test message to the external ip address (10.178.196.123) nothing show , so my question is : is there any problem in my code ? and if not why test message not recieved by the server ? and is this approach is the most suitable approach for p2p appications (Hole punching is not an option in my situation)?
This is my connections after mapping the ports and running the server ( with Netstat ) :
Proto Local Address Foreign Address State
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1025 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1026 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1027 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1028 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1029 0.0.0.0:0 LISTENING
TCP 0.0.0.0:2869 0.0.0.0:0 LISTENING
TCP 0.0.0.0:5357 0.0.0.0:0 LISTENING
TCP 127.0.0.1:1242 127.0.0.1:4823 ESTABLISH
TCP 127.0.0.1:1244 127.0.0.1:4836 ESTABLISH
TCP 127.0.0.1:4823 127.0.0.1:1242 ESTABLISH
TCP 127.0.0.1:4836 127.0.0.1:1244 ESTABLISH
TCP 192.168.8.102:139 0.0.0.0:0 LISTENING
TCP 192.168.8.102:2869 192.168.8.1:51156 TIME_WAIT
TCP 192.168.8.102:2869 192.168.8.1:51157 TIME_WAIT
TCP 192.168.8.102:2869 192.168.8.1:51158 TIME_WAIT
TCP 192.168.8.102:4683 198.252.206.25:443 ESTABLISH
TCP 192.168.8.102:4824 104.16.35.249:80 ESTABLISH
TCP 192.168.8.102:4831 172.217.19.238:443 ESTABLISH
TCP 192.168.8.102:4832 94.142.38.38:443 ESTABLISH
TCP 192.168.8.102:4835 94.142.38.53:443 ESTABLISH
TCP 192.168.8.102:4837 104.16.33.249:80 ESTABLISH
TCP 192.168.8.102:4839 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4840 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4841 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4842 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4843 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4844 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4845 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4846 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4847 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4848 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4849 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4850 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4851 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4852 192.168.8.1:50473 TIME_WAIT
TCP 192.168.8.102:4853 192.168.8.1:50473 TIME_WAIT
TCP [::]:135 [::]:0 LISTENING
TCP [::]:445 [::]:0 LISTENING
TCP [::]:1025 [::]:0 LISTENING
TCP [::]:1026 [::]:0 LISTENING
TCP [::]:1027 [::]:0 LISTENING
TCP [::]:1028 [::]:0 LISTENING
TCP [::]:1029 [::]:0 LISTENING
TCP [::]:2869 [::]:0 LISTENING
TCP [::]:5357 [::]:0 LISTENING
UDP 0.0.0.0:3702 *:*
UDP 0.0.0.0:3702 *:*
UDP 0.0.0.0:3702 *:*
UDP 0.0.0.0:3702 *:*
UDP 0.0.0.0:5355 *:*
UDP 0.0.0.0:20000 *:*
UDP 0.0.0.0:52766 *:*
UDP 0.0.0.0:55825 *:*
UDP 127.0.0.1:1900 *:*
UDP 127.0.0.1:63074 *:*
UDP 192.168.8.102:137 *:*
UDP 192.168.8.102:138 *:*
UDP 192.168.8.102:1900 *:*
UDP 192.168.8.102:63073 *:*
UDP [::]:3702 *:*
UDP [::]:3702 *:*
UDP [::]:3702 *:*
UDP [::]:3702 *:*
UDP [::]:5355 *:*
UDP [::]:52767 *:*
UDP [::]:55826 *:*
UDP [::1]:1900 *:*
UDP [::1]:63072 *:*
UDP [fe80::bc13:29c3:a8c3:c74a%16]:546 *:*
UDP [fe80::bc13:29c3:a8c3:c74a%16]:1900 *:*
UDP [fe80::bc13:29c3:a8c3:c74a%16]:63071 *:*
来源：https://stackoverflow.com/questions/37237337/c-sharp-upnp-not-seems-to-be-work