Código PHP:
<?php
/**/
set_time_limit (300);
define('E_STRICT', 2048);
error_reporting(E_ALL | E_STRICT);
$socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
socket_bind($socket, '10.0.0.30', 200);
$from = "100.95.162.242";
$port = 51196;
socket_recvfrom($socket, $buf, 57, 0, $from, $port);
echo "Received $buf from remote address $from and remote port $port" . PHP_EOL;
/**/
?>