UDP套接字无法发送数据包到DHCP地址
问题描述:
我已经创建了简单的UDP套接字连接在本地网络之间发送数据。该连接有两种类型:对等和组播。下面是我的课: 点对点服务器:UDP套接字无法发送数据包到DHCP地址
public class CandyCaneUdpServer
{
Socket sck;
EndPoint LocalEP;
EndPoint RemoteEP;
int port = 80;
IAsyncResult oldAsyncResult;
public event EventHandler<MessageObject> RaiseMessageReceivedEvent;
public CandyCaneUdpServer()
{
sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
sck.ExclusiveAddressUse = false;
LocalEP = new IPEndPoint(IPAddress.Parse(UdpUtility.GetLocalIP()), port);
RemoteEP = new IPEndPoint(IPAddress.Any, port);
}
public void Serve()
{
sck.Bind(LocalEP);
byte[] _buffer = new byte[1500];
oldAsyncResult = sck.BeginReceiveFrom(_buffer, 0, _buffer.Length, SocketFlags.None, ref RemoteEP, new AsyncCallback(MessageCallBack), _buffer);
}
private void MessageCallBack(IAsyncResult aResult)
{
int size = sck.EndReceiveFrom(aResult, ref RemoteEP);
if (size > 0)
{
byte[] receivedData;
receivedData = (byte[])aResult.AsyncState;
MessageObject obj;
IFormatter f = new BinaryFormatter();
using (MemoryStream s = new MemoryStream(receivedData))
{
obj = (MessageObject)f.Deserialize(s);
}
OnRaiseMessageReceivedEvent(obj);
}
var _buffer = new byte[1500];
oldAsyncResult = sck.BeginReceiveFrom(_buffer, 0, _buffer.Length, SocketFlags.None, ref RemoteEP, new AsyncCallback(MessageCallBack), _buffer);
}
protected virtual void OnRaiseMessageReceivedEvent(MessageObject e)
{
EventHandler<MessageObject> handler = RaiseMessageReceivedEvent;
if (handler != null)
{
handler(this, e);
}
}
}
下面是点对点客户端(发送方):
public class CandyCaneUdpClient
{
Socket sck;
EndPoint RemoteEP;
public CandyCaneUdpClient(string RemoteIP, int RemotePort)
{
sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
sck.ExclusiveAddressUse = false;
RemoteEP = new IPEndPoint(IPAddress.Parse(RemoteIP), RemotePort);
}
public void Send(int MessageId, string Message, __MessageObjectType t = __MessageObjectType.P2P)
{
byte[] msg;
msg = Encoding.UTF8.GetBytes(Message);
var obj = new MessageObject()
{
Id = MessageId,
Type = t,
SourceIP = UdpUtility.GetLocalIP(),
TargetIP = ((IPEndPoint)RemoteEP).Address.ToString(),
SentTime = DateTime.Now,
Message = Message
};
IFormatter f = new BinaryFormatter();
using (MemoryStream ms = new MemoryStream())
{
f.Serialize(ms, obj);
var msgByte = ms.ToArray();
sck.SendTo(msgByte, msgByte.Length, SocketFlags.None, RemoteEP);
}
}
}
的代码对所有以太网机工作正常。当连接wifi客户端时,无线PC可以发送数据但不接收数据。当我检查IP时,以太网客户端的IP为192.168.211 .---。而无线PC的IP为192.168.0 .---。我想知道DHCP地址是否会导致此问题。群聊功能正常。
public class CandyCaneUdpGroupChatListener
{
UdpClient listener;
IPAddress routerBindIP;
readonly int routerBindPort = UdpUtility.GroupChatDefinedPort();
EndPoint routerEP, senderEP;
public event EventHandler<MessageObject> RaiseMessageReceivedEvent;
public CandyCaneUdpGroupChatListener()
{
routerBindIP = IPAddress.Parse(UdpUtility.GroupChatRouterBindAddress());
routerEP = new IPEndPoint(routerBindIP, routerBindPort);
senderEP = new IPEndPoint(IPAddress.Parse(UdpUtility.GetLocalIP()), routerBindPort);
listener = new UdpClient();
listener.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
listener.ExclusiveAddressUse = false;
listener.Client.Bind(senderEP);
listener.JoinMulticastGroup(routerBindIP);
var _buffer = new byte[1500];
listener.Client.BeginReceiveFrom(_buffer, 0, _buffer.Length, SocketFlags.None, ref routerEP,
new AsyncCallback(ReceiveMessage), _buffer);
}
private void ReceiveMessage(IAsyncResult result)
{
if (listener == null) return;
if (listener.Client == null) return;
int size = listener.Client.EndReceiveFrom(result, ref routerEP);
if (size > 0)
{
byte[] receivedData;
receivedData = (byte[])result.AsyncState;
MessageObject obj;
IFormatter f = new BinaryFormatter();
using (MemoryStream s = new MemoryStream(receivedData))
{
obj = (MessageObject)f.Deserialize(s);
//if (obj.SourceIP == UdpUtility.GetLocalIP()) return;
}
MessageReceived(obj);
}
var _buffer = new byte[1500];
listener.Client.BeginReceiveFrom(_buffer, 0, _buffer.Length, SocketFlags.None, ref routerEP,
new AsyncCallback(ReceiveMessage), _buffer);
}
protected virtual void MessageReceived(MessageObject e)
{
EventHandler<MessageObject> handler = this.RaiseMessageReceivedEvent;
if (handler != null)
{
handler(this, e);
}
}
public void Disconnect()
{
listener.DropMulticastGroup(routerBindIP);
}
}
答
查看如何布置有线和无线网络子网。看起来你有两台不同的DHCP服务器在这里工作 - 一台用于有线网络,另一台用于无线网络。
确保您的网络路由器配置为使得一个子网上的主机可以与另一个子网上的主机进行通信。
要确定一个子网上的主机是否可以与另一个子网上的主机通信,可以使用网络跟踪路由实用程序或ping实用程序。
在Windows上,跟踪路由实现为tracert.exe
应用程序,您应该在C:\Windows\System32
目录中找到该应用程序。
假设你是以太网连接的客户端上,你可能会用下面的命令行执行它试图跟踪路由到无线PC(假设它有地址192.168.0.104):
C:> \Windows\System32\tracert.exe 192.168.0.104
您应该看到输出类似于此:
Tracing route to 192.168.0.104
over a maximum of 30 hops:
1 1 ms 1 ms <1 ms 192.168.211.54
... (possibly other entries her)
2 1 ms 1 ms 1 ms 192.168.0.104
Trace complete.
如果跟踪未能完成,这是一个表明您的网络流量不能得到你想跟踪到机器。
请注意,如果tracert
发生故障,它不是100%指示连接失败。这可能表示ICMP流量正在被防火墙阻止,或者目标机器未响应ICMP请求。
不幸的是,我无法访问设备。 –
尝试跟踪。以太网附加追踪机结果**请求超时**无线连接的笔记本电脑追踪成功。我不明白为什么连接只能走一个方向。 –
也许这是一个防火墙配置问题。确保在两台机器上都打开应用程序通信所需的所有端口。 – STLDeveloper