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Aquí os dejo una clase Ping para hacer comprabaciones de Ping TCP/IP

using System;

using System.Drawing;

using System.Collections;

using System.Windows.Forms;

using System.Net;

using System.Net.Sockets;

using System.Runtime.InteropServices;

using System.Text; 

namespace NombreDelNamespace

{

      /// <summary>

      /// Descripción breve de Ping.

      /// </summary>

      public class Ping

      {

            public Ping()

            {

                  //

                  // TODO: agregar aquí la lógica del constructor

                  //

            }

 

           

            ///<summary>

            /// Le pasamos la direccion url a la que hacer el ping y un listbox para mostrar resultados

            ///</summary>

            public static bool PING (string DireccionIP,ListBox listBox1)

            {

                  string addr = DireccionIP;

 

                  byte[] RequestData = Encoding.ASCII.GetBytes( new string('\0', 64) );

 

                  //Allocate ICMP_ECHO_REPLY structure

                  ICMP_ECHO_REPLY reply = new ICMP_ECHO_REPLY(255);

                  reply.DataSize = 255;

                  IntPtr pData = LocalAlloc(LMEM_ZEROINIT, reply.DataSize);

                  reply.Data = pData;

                  IntPtr h = IcmpCreateFile();

 

                  //uint ipaddr = (uint)entry.AddressList[0].Address;

                  uint ipaddr = (uint)System.Net.IPAddress.Parse(addr).Address;

 

                  listBox1.Items.Clear();

                 

                  for ( int i = 0; i < 4; i++ )

                  {

                        uint ret = IcmpSendEcho(h, ipaddr, RequestData, (short)RequestData.Length, IntPtr.Zero, reply._Data, reply._Data.Length, 1000);

                        int dwErr = 0;

                        if ( ret == 0 )

                        {

                             dwErr = GetLastError();

                             if ( dwErr != 11010 ) // If error is other than timeout - display a message

                                   return false;

                        }

                        if ( dwErr != 11010 )

                        {

                             listBox1.Items.Add(string.Format("RTT: {0}, Data Size: {1}; TTL: {2}", reply.RoundTripTime, reply.DataSize, reply.Ttl));

                        }

                        else

                        {

                             listBox1.Items.Add("Request timed out");

                             return false;

                        }

 

                        listBox1.SelectedIndex = listBox1.Items.Count - 1;

                        Application.DoEvents();

                        System.Threading.Thread.Sleep(100);

                  }

                  IcmpCloseHandle(h);

                  LocalFree(reply.Data);

                  return true;

            }

 

           

            //-------------------------------------------------------

            public static bool EstaConectado (string Direccion)

            //-------------------------------------------------------

            {

                  string addr = Direccion;

                  bool Estado = false;

 

                  try

                  {

                        byte[] RequestData = Encoding.ASCII.GetBytes( new string('\0', 64) );

 

                        //Allocate ICMP_ECHO_REPLY structure

                        ICMP_ECHO_REPLY reply = new ICMP_ECHO_REPLY(255);

                        reply.DataSize = 255;

                        IntPtr pData = LocalAlloc(LMEM_ZEROINIT, reply.DataSize);

                        reply.Data = pData;

                        IntPtr h = IcmpCreateFile();

 

                       

                        //uint ipaddr = (uint)entry.AddressList[0].Address;

 

                        uint ipaddr = (uint)System.Net.IPAddress.Parse(addr).Address;

     

                        uint ret = IcmpSendEcho(h, ipaddr, RequestData, (short)RequestData.Length, IntPtr.Zero, reply._Data, reply._Data.Length, 1000);

                        int dwErr = 0;

                 

                        // Si ret es 0 ha habido algun error

                        //if ( ret == 0 ) Estado=false;

                                        

                        if ( ret != 0 )if ( dwErr != 11010 ) Estado=true;

 

                        IcmpCloseHandle(h);

                        LocalFree(reply.Data);

                  }

                  catch{Estado=false;}

                 

                  return Estado;

            }

 

            #region Memory Management

            [DllImport("coredll")]

            extern public static IntPtr LocalAlloc(int flags, int size);

            [DllImport("coredll")]

            extern public static IntPtr LocalFree(IntPtr pMem);

 

            const int LMEM_ZEROINIT = 0x40;

 

            #endregion

 

 

            #region IPHLPAPI P/Invokes

            [DllImport("iphlpapi")]

            extern public static IntPtr IcmpCreateFile ();

 

            [DllImport("iphlpapi")]

            extern public static bool IcmpCloseHandle(IntPtr h);

 

            [DllImport("iphlpapi")]

            extern public static uint IcmpSendEcho(

                  IntPtr IcmpHandle,

                  uint DestinationAddress,

                  byte[] RequestData,

                  short RequestSize,

                  IntPtr /*IP_OPTION_INFORMATION*/ RequestOptions,

                  byte[] ReplyBuffer,

                  int ReplySize,

                  int Timeout );

 

            #endregion

 

            [DllImport("coredll")]

            extern static int GetLastError();

 

     

 

            public class ICMP_ECHO_REPLY

      {

            public ICMP_ECHO_REPLY(int size) { data = new byte[size]; }

            byte[] data;

            public byte[] _Data { get { return data; } }

            public int Address { get { return BitConverter.ToInt32(data, 0); } }

            public int Status { get { return BitConverter.ToInt32(data, 4); } }

            public int RoundTripTime  { get { return BitConverter.ToInt32(data, 8); } }

            public short DataSize  { get { return BitConverter.ToInt16(data, 0xc); }  set { BitConverter.GetBytes( value ).CopyTo(data, 0xc);} }

            public IntPtr Data { get { return new IntPtr(BitConverter.ToInt32(data, 0x10)); }  set { BitConverter.GetBytes( value.ToInt32() ).CopyTo(data, 0x10);} }

            public byte Ttl {get { return data[0x14]; } }

            public byte Tos {get { return data[0x15]; } }

            public byte Flags {get { return data[0x16]; } }

            public byte OptionsSize {get { return data[0x17]; } }

            public IntPtr OptionsData { get { return new IntPtr(BitConverter.ToInt32(data, 0x18)); }  set { BitConverter.GetBytes( value.ToInt32() ).CopyTo(data, 0x18);} }

      }

 

 

      }

}

Autor: Antonio Lopez Atienza