title: PHP: ARP?? Replying to an ARP Request
body: <p>I know this may be an impossible question, since we are dealing with two different layers of the network, but is it possible to send a reply to an ARP request using PHP sockets?</p>
  
  <p>If so how....such as What port and ip address would you connect the socket to?  Again, I understand that arp doesn't use a port number...at least not that I can tell.</p>
  
  <p>I want to do it in PHP, but for those that are going to question my intentions, it is ultimately for a program I am writing for a some piece of hardware.  It seems that as though the NIC does not reply to ARP requests, so I want to generate the response manually.</p>
  
  <p>Basically, the only sort of functions that would get me close are socket functions. UDP and TCP.</p>
  
  <p>Oh, I forgot....if Arp is not possible with sockets, is it possible that when I broadcast an "A" record for my hostname, that I can give my MAC address to the router in some sort of dns answer, so the router can respond to arp requests for the hardware's ip address.</p>