#!/usr/bin/perl

use strict;
use warnings;

use IO::Socket::INET;

my $port   = getservbyname 'bootps', 'udp'; 
my $socket = IO::Socket::INET -> new (LocalPort  => $port, 
                                      Broadcast  =>  1,
                                      Proto      => 'udp')
             or die "Failed to bind to socket: $@";

my $mess;     
while ($socket -> recv ($mess, 1024)) {  
    print "Saw a bootp request.\n";
}

__END__

##</code><code>##

udp        0      0 *:bootps                *:*