C# Traceroute using .net framework

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();
}

Comments (5) -

none
10/20/2009 11:47:44 AM #

thanks! just what I was looking for

chachunasayan
5/5/2012 5:56:00 PM #

Thanks for your code I'm using it in my asp.net application, the code runs fine when I'm testing in on my PC (localhost), but when the application is uploaded to a web server, the traceroute prints only ttls e.g.,:

1  5555ms
2  5244ms
.. and so on.

Can you kindly guide me as to what the problem can be?

Marius Musat
1/10/2013 9:25:57 AM #

i wonder why if you trace route on a hostname it returns some macs or something while doing it on ips works fine

RobRdam
3/4/2013 1:24:05 AM #

For those who are like me not familiar with the Stopwatch function: it's in the System.Diagnostics class, so either create a using statement or precede the Stopwatch creation with System.Diagnostics.

Thanks for the code!

jscott
3/4/2013 10:36:54 AM #

RobRdam, thanks for the comment. I will fixup the code example so that it shows all the using statements and makes it easier to copy and paste the code as I had an issue myself just now trying to get the code example out Wink

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