If you have ever tried to create a traceroute program using one of the few available ICMP libraries freely available for C# you may have run into some issues mainly to do with the ICMP checksum not being correct. It seems that as of .NET 2.0 framework that microsoft included a Ping class that makes it really easy to then use it to create a traceroute utility. Here is some basic code to create a traceroute utility.
public string Traceroute(string ipAddressOrHostName)
{
IPAddress ipAddress = Dns.GetHostEntry(ipAddressOrHostName).AddressList[0];
StringBuilder traceResults = new StringBuilder();
using(Ping pingSender = new Ping())
{
PingOptions pingOptions = new PingOptions();
Stopwatch stopWatch = new Stopwatch();
byte[] bytes = new byte[32];
pingOptions.DontFragment = true;
pingOptions.Ttl = 1;
int maxHops = 30;
traceResults.AppendLine(
string.Format(
"Tracing route to {0} over a maximum of {1} hops:",
ipAddress,
maxHops));
traceResults.AppendLine();
for(int i = 1; i < maxHops + 1; i++)
{
stopWatch.Reset();
stopWatch.Start();
PingReply pingReply = pingSender.Send(
ipAddress,
5000,
new byte[32], pingOptions);
stopWatch.Stop();
traceResults.AppendLine(
string.Format("{0}\t{1} ms\t{2}",
i,
stopWatch.ElapsedMilliseconds,
pingReply.Address));
if(pingReply.Status == IPStatus.Success)
{
traceResults.AppendLine();
traceResults.AppendLine("Trace complete."); break;
}
pingOptions.Ttl++;
}
}
return traceResults.ToString();
}