short code snippit showing howto use UDP for broadcasting to a whole subnet of addresses couldn't find this in any of the books... simple but you have to figure it out... 
#!/usr/bin/perl
#
use strict;
use IO::Socket;

# defaults
my $bcaddr = '192.168.254.255';
my $port = 9870;

socket(sock, PF_INET, SOCK_DGRAM, getprotobyname("udp"))
    or die "socket:$@";
setsockopt(sock, SOL_SOCKET, SO_BROADCAST, 1)
    or die "setsockopt:$@";

my $dest = sockaddr_in($port,inet_aton($bcaddr));

# 10 udp's on the wire
for (my $i=0;$i < 10;$i++) {
    my $data = 'UDP packet ' . $i;
    # send udp packet
    send(sock,$data,0,$dest) || die "send(): $!";
}

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In reply to howto UDP broadcasts by fjonckers

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