Iam尝试从我的客户端向我的服务器发送消息(通过UDP)。服务器应该回答这个消息,如果客户端收到这个答案,他应该打印出一条消息。C#UDP服务器/客户端 - NAT
如果我运行我的本地网络上的客户端和服务器一切正常。 如果我尝试通过互联网从另一台PC连接到我的网络外,服务器收到客户端请求,发回答案,但客户端永远不会收到此答案。客户端和服务器都在NAT后面,但我在服务器的NAT上转发了这些端口,并且服务器拥有了自己的DNS。我已经尝试过NAT遍历,但在接收到客户端请求后,它给了我与服务器的IPEndPoint相同的IP和端口地址。
我不知道如何解决这个问题,所以任何指导都将不胜感激。
客户
public static void Main()
{
Thread receiveThread = new Thread(new ThreadStart(ReceiveData));
receiveThread.Start();
object[] oData = {1};
sendData(oData, 0,0, "Li");
while (true)
{
Console.ReadLine();
}
}
private void receiveData()
{
string receivePort = 8080;
Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
client.ReceiveTimeout = 1000;
IPEndPoint end = new IPEndPoint(IPAddress.Any, receivePort);
client.Bind(end);
while (true)
{
try
{
byte[] data = new byte[1024];
client.Receive(data, 0, data.Length, SocketFlags.None);
object[] receivedObj = Deserialize(data);
string sType = (string)receivedObj[3];
if (sType == "Li")
{
console.WriteLine("received Li");
}
}
catch (Exception err)
{
Console.WriteLine(err.ToString());
}
}
}
public static void sendData(object[] oData, int iFrom, int iTo, string sType)
{
string sendPort = 17171;
UdpClient client = new UdpClient();
string IP = "ThisIsTheDNSofmyServer.com"; //ServerDNS
//string IP = "192.168.xxx.xxx"; //serverIP in LAN
if (IP.StartsWith("T"))
{
IP = (Dns.GetHostAddresses(IP))[0].ToString();
}
IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Parse(IP), sendPort);
oData[1] = iFrom;
oData[2] = iTo;
oData[3] = sType;
Byte[] data = Serialize(oData);
client.Send(data, data.Length, remoteEndPoint);
}
的server's代码几乎是相同的:
public static void Main()
{
Thread receiveThread = new Thread(new ThreadStart(ReceiveData));
receiveThread.Start();
while (true)
{
Console.ReadLine();
}
}
private static void ReceiveData()
{
int receivePort = 17171;
UdpClient client = new UdpClient(receivePort);
while (true)
{
try
{
IPEndPoint anyIP = new IPEndPoint(IPAddress.Any, 0);
byte[] data = new byte[1024];
data = client.Receive(ref anyIP);
object[] receivedObj = Deserialize(data);
//if I receive data send an Answer
sendData(receivedObj, 0,0,"Li",anyIP.Address.ToString());
}
catch (Exception err)
{
Console.WriteLine(err.ToString());
}
}
}
private static void sendData(object[] oData, int iFrom, int iTo, string sType, string IP)
{
int sendPort = 8080;
object[] paket = { oData, iFrom, iTo, sType };
UdpClient client = new UdpClient();
IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Parse(IP), sendPort);
client.Send(data, data.Length, remoteEndPoint);
}
不确定,但您可以检查防火墙设置 – 2012-02-22 11:46:36
关闭客户端和服务器上的所有防火墙以消除潜在问题。如果您的客户端向服务器发送消息,并且服务器接收到该消息,则客户端肯定会收到服务器的答复。除了第三方防火墙之外,您还可以使用Windows防火墙。尝试打开客户端和服务器路由器的DMZ /端口转发。如果它仍然不起作用,我不太确定它可能是什么。 – Jason 2012-02-24 03:41:12