Ping Buffer Size

Is it possible to ping a specified host with 65001 or more buffer size? I tried this in windows. But it display this message...

Bad value for option -l, valid range is from 0 to 65500

Code (markup):

Why?

thanks in advice...

 

According to RFC 2925 (which, among other things, defines ping) the answer is no (well, actual limit is a couple of bytes more, as you'll see below).

From the spec (emphasis below is mine):

You can find the rfc here: http://www.rfc-archive.org/getrfc.php?rfc=2925

The quote is a fifth of the way down the page.

 

Hum, seems you are trying to play with the ping of death

 

Here is what I got under Linux

 

Well, hmmmm, I'm not trying to play with ping of death. I just want to learn... but i need to know why my program stops responding if i change buffer size to a value higher than this limit...

Native library removed for security reasons...

public final class PingKnVX {
    private int socket;
    
    public PingKnVX() {
        socket = 0;
    }
    
    public final boolean begin(){
        if (socket != 0)
            return false;
        boolean flag = close(socket);
        socket = 0;
        return flag;
        
    }
    
    public final boolean end(){
        if (socket == 0)
            return false;
        boolean flag = close(socket);
        socket = 0;
        return flag;
    }
    
    public final boolean ping(String s, int i, int j){
        
        if (s == null || s.length() < 7 || s.length() > 15)
            return false;
        
       [COLOR="Red"] if (i < 0 || i > 65535) [/COLOR]
            return false;
        
       [COLOR="Red"] if (j < 0 || j > 65535)[/COLOR]
            return false;
        
        short word0;
        
        synchronized (this){
            word0 = sendPing(socket, s, i, j);
        }
        
        switch (word0){
            case 0: return true;
        }
        return false;
    }
    
    public final boolean pong(String as[]){
        byte abyte0[] = new byte[16];
        int ai[] = new int[3];
        int i = 0;
        if (as == null || as.length < 4)
            return false;
        
        do {
            short word0;
            synchronized (this){
                word0 = recvPing(socket,(short)0, abyte0, ai);
            }
            switch (word0){
                case -10:
                case -5:
                case -4:
                case -2:
                    i = 5;
                    try {
                        Thread.sleep(i);
                    }catch (Exception ex){
                        // do nothing
                    }
                    break;
                    
                case 0:
                    int j;
                    for (j = 0; j < abyte0.length; j++){
                        if (abyte0[j]==0)
                            break;
                        
                        as[0] = new String(abyte0, 0, j);
                        as[1] = new String(Integer.toString(ai[0]));
                        as[2] = new String(Integer.toString(ai[1]));
                        
                        int k = ai[2] -i;
                        if (i != 0 && k < 0)
                            k = i - k;
                        as[3] = new String(Integer.toString(k));
                        return true;    
                    }
                    
                default:
                    return false;
            }
        }while(true);
    }
    private native int open();
    private native boolean close(int i);
    private native short sendPing(int i, String s, int j, int k);
    private native short recvPing(int i, short word0, byte abyte0[], int ai[]);
    
    static {
        try {
            System.loadLibrary("MYLIB");
        }catch(SecurityException e) {
            System.out.println("Error in loading dll");
            throw e; 
        }catch (UnsatisfiedLinkError x){
            System.out.println("Native library not found");
            throw x;
        }
    }
}

public class Main {
    
    
              public static void main(String args[]) throws Exception
                    {
                    PingKnVX ping = new PingKnVX();
                    String[] dataRcv=new String[4];   

                    ping.begin();


                    if ( ping.ping("127.0.0.1", 5, 1) );   if no problem, it'll return "true".
                         {
                         ping.pong (dataRcv); is
                                      
                         System.out.println ("Host: "+dataRcv[0]+" ping time1: "+dataRcv[3]);
                         }

                   

                   

                    ping.end(); 
                    }
              } 

Code (markup):

 

Hello,

If you use an ICMP API to handle your ping, it is possible the API won't accept you to use a large buffer. In that case, I would recommand you to use Raw packets APIs.

Regards
Thibaut