What potential issues can arise when using a PHP script for Wake-on-LAN across multiple subnets?

One potential issue that can arise when using a PHP script for Wake-on-LAN across multiple subnets is that the broadcast packet may not reach devices on different subnets due to network restrictions. To solve this issue, you can use a UDP packet sender to send the Wake-on-LAN magic packet directly to the target device's IP address instead of relying on broadcast packets. 

$mac_address = '00:11:22:33:44:55';
$ip_address = '192.168.1.100';
$port = 9;

$mac_hex = str_replace(':', '', $mac_address);
$magic_packet = pack('H12', 'FFFFFFFFFFFF') . str_repeat(pack('H12', $mac_hex), 16);

$socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
socket_sendto($socket, $magic_packet, strlen($magic_packet), 0, $ip_address, $port);
socket_close($socket);

Keywords

PHP script Wake-on-LAN multiple subnets network configuration broadcast packet.

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