以下的代码的原作是opensource的一个叫sniffer.net的，用vb.net写的，这里只是简单的用c#翻译了一下，暂时还只能监控所有数据包，不能监控某一个进程的数据包,代码如下：
using System;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;

namespace UpdateTester
{
/**//// <summary>
/// Monitor 的摘要说明。
/// </summary>
public class Monitor
{
public delegate void NewPacketEventHandler(Monitor m, Packet p);
public event NewPacketEventHandler NewPacket;
private Socket m_Monitor;
private IPAddress m_Ip;
private byte[] m_Buffer = new byte[65535];
private const System.Int32 IOC_VENDOR = 0x18000000;
private const int IOC_IN = -2147483648;
private const int SIO_RCVALL = IOC_IN ^ IOC_VENDOR ^ 1;
private const int SECURITY_BUILTIN_DOMAIN_RID = 0x20;
private const int DOMAIN_ALIAS_RID_ADMINS = 0x220;

public System.Net.IPAddress IP
{
get { return m_Ip; }
}

public byte[] Buffer
{
get { return m_Buffer; }
}

public Monitor()
{
   //
   // TODO: 在此处添加构造函数逻辑
   //
}

public Monitor(IPAddress IpAddress)
{
   if (!(Environment.OSVersion.Platform == PlatformID.Win32NT) && Environment.OSVersion.Version.Major<5)
   {
    throw new NotSupportedException("This program requires Windows 2000, Windows XP or Windows .NET Server!");
   }
   m_Ip = IpAddress;
}

public void Start()
{
   if (m_Monitor==null)
   {
    try
    {
     m_Monitor = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);

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