title: Is it possible to find out MAC address of directly wired connected device?
body: <p>I would like to read MAC address of attached device at the other side of the wire.
  Suppose to have 2 device, that are directly connected by wire. 
  The first one (DeviceX) has Ethernet interface already configured (Static IP ....).
  The second one (DeviceY) doesn't know anything about DeviceX , but they are physically connected. </p>
  
  <p>There are some way to read DeviceX MAC Address from DecviceY ? 
  It's possible to send some particular packet from DeviceY in such a way the DeviceX reply with some packet ? </p>
  
  <p>I have free access to network API for DeviceY, but about DeviceX i can't do anything.</p>
  
  <p>Thanks in advance.</p>