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  my $udp_server = shift @ARGV;

...

    socket (UDP_SOCK, PF_INET, SOCK_DGRAM, $trans_serv);
  }

  use constant REMOTE_HOST => $udp_server;

  Bad arg length for Socket::pack_sockaddr_in, length is 0, should be 
+4 at
  /opt/perl/lib/5.3.7/i686-linux-thread-multi/Socket.pm line 373

  my $udp_server = shift @ARGV;

...
    use constant SIMPLE_UDP_PORT => 4001;
      :
      :