Exploring Trace Routes

Click here for a larger image.

Environment: VC6 SP4, NT4 SP3, winCE 2.0


This project was undertaken because of the need to explore sockets and their different uses. I started by making a ping program that pinged the network addresses. The ping program was inspired by FAQs at http://tangentsoft.net/wskfaq/ and mostly used their functions!!!! The route program is an enhancement of the same program (ping program) that used raw sockets.

How to Run It

The standard Trace Route that comes with the Windows Operating System was basically an example for me to emulate. The shortcomings (which is my point of view) with the standard Trace Route was the delay it had, which takes three (and I presume ICMP Packet replies). My program takes one ICMP reply. As soon as I get an ICMP_ECHO(integer 0) reply, I know that the packet has reached the destination and the program exits.

Go to Command Prompt ... in the Dos Prompt. Type the Path or the EXE and with space, type the URL or ip Address such as C:\>TracesRoutes.exe x.x.x.x Remember to type a valid IP Address; otherwise, an error message "Destination Unreachable " would be given.

The Code

All of the code is the same except for a few changes here and there. The main function is Decode_Reply.

int decode_reply( IPHeader* reply, int bytes, sockaddr_in* from )
    // Make sure the reply is sane
    if (bytes < header_len + ICMP_MIN)
        cerr << "too few bytes from " << inet_ntoa(from->sin_addr)
                                      << endl;
        return -1;
    else if ( icmphdr->type != ICMP_ECHO_REPLY )
        if ( icmphdr->type != ICMP_TTL_EXPIRE )
            if ( icmphdr->type == ICMP_DEST_UNREACH )
                cerr << "Destination unreachable" << endl;
                cerr << "Unknown ICMP packet type "
                     << int(icmphdr->type) <<
                        " received" << endl;
            return -1;
        // If "TTL expired", fall through. Next test will fail
        // if we try it, so we need a way past it.
    else if (icmphdr->id != (USHORT)GetCurrentProcessId())
        // Must be a reply for another pinger running locally,
        // so just ignore it.
        return -2;

    // Okay, we ran the gamut, so the packet must be legal --
    // dump it
    if (( icmphdr->type == ICMP_TTL_EXPIRE ) ||
        ( icmphdr->type == ICMP_ECHO_REPLY ) )
        in_addr in;
        in.S_un.S_addr = reply->source_ip;
        cout << "\n Source IP " << inet_ntoa( in ) ;
        int nTime = GetTickCount () - ulTimestamp ;
        if ( nTime < 0 )
            cout << "  Time: " << "<10 ms."
                 << endl;
            cout << "  Time: " << ( GetTickCount() -
                 ulTimestamp ) << " ms." << endl;
    return> 0;


If you are facing problems, contact your system administrator. I have tested this software on both private and public IPs. Mostly, System Administrators disable this functionality. If you are on a network, you can trace another computer on same network to test it.


Kindly send your comments to http://babarq.netfirms.com. Thanx.


Download demo project - 36 Kb


  • TraceRoute

    Posted by Legacy on 07/31/2003 12:00am

    Originally posted by: Babar

    Updated .... but dont know how to Edit my Contribution here .... ask me for Src

  • problem

    Posted by Legacy on 12/10/2002 12:00am

    Originally posted by: luru

    Maybe you haven't set proper wait timeout.So when it receives nothing,it will down.

  • Source

    Posted by Legacy on 12/06/2002 12:00am

    Originally posted by: Richard

    Could you please post the source code?


    • Do you have the Java source code,please?

      Posted by fengyeqing on 04/15/2005 09:54pm

      My E_mail: sunzhiyang2003@yahoo.com.cn

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • As the mobile enterprise marketplace expands and customer needs grow more diverse, Samsung recognizes that solution partners and developers play an essential role by continually innovating to meet their customers' needs. Samsung works to provide these developers and partners with the latest tools and resources needed to create these solutions. Read this program guide to learn how the Samsung Enterprise Alliance Program provides partners and developers with Samsung enterprise software development kits (SDKs) …

  • U.S. companies are desperately trying to recruit and hire skilled software engineers and developers, but there's simply not enough quality talent to go around. In response, companies often resort to inferior solutions -- hiring substandard developers and engineers, recruiting talent on a part-time or temporary basis, poaching people from competitors, or burdening an already stressed IT staff for more of their labor. Fortunately, there's a better solution. Read this white paper to learn the business value of …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date