关于Socket编程的问题.......

Question

Packet Sniffer
http://www.prism.gatech.edu/~gte477n/languages/csharp/Simple Sniffer in C#  
http://www.c-sharpcorner.com/Network/SimpleSnifferInCSLM.asp

Answer 1

tcpClient.Connect("www.contoso.com", 80);

Answer 2

const int portNumber = 80;//这里就是侦听端口
      TcpListener tcpListener = new TcpListener(portNumber);      tcpListener.Start();
另外Socket.Bind()也提供IPEndPoint;来指定端口!