note 126907 added to function.socket-get-option

to receive UDP DHCP packets on a dedicated interface, you have to use the undocumented option SO_BINDTODEVICE: <?php $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP); socket_set_option($socket, SOL_SOCKET, SO_BINDTODEVICE, 'eth1'); socket_set_option($socket, SOL_SOCKET, SO_BROADCAST, 1); socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1); socket_set_option($socket, SOL_SOCKET, SO_REUSEPORT, 1); socket_bind($socket, '255.255.255.255', 67); while (1) { if ($src = @socket_recv($socket, $data, 9999, 0)) { echo $data . PHP_EOL; } } ?> ---- Server IP: 45.112.84.4 Probable Submitter: 80.90.5.135 (proxied: 46.30.112.51) ---- Manual Page -- https://php.net/manual/en/function.socket-get-option.php Edit -- https://main.php.net/note/edit/126907 Del: integrated -- https://main.php.net/note/delete/126907/integrated Del: useless -- https://main.php.net/note/delete/126907/useless Del: bad code -- https://main.php.net/note/delete/126907/bad+code Del: spam -- https://main.php.net/note/delete/126907/spam Del: non-english -- https://main.php.net/note/delete/126907/non-english Del: in docs -- https://main.php.net/note/delete/126907/in+docs Del: other reasons-- https://main.php.net/note/delete/126907 Reject -- https://main.php.net/note/reject/126907 Search -- https://main.php.net/manage/user-notes.php