title: Lua wireshark dissector: comparing ethernet address
body: <p>I'm starting my first Lua dissector. Between two hard-coded ethernet addresses
  my payload protocol is running. How to do the correct comparison within the dissector?</p>
  
  <p>Something like</p>
  
  <pre><code>if buf(0,6):ether() == ??? and buf(6,6):ether() == ??? then
  ...
  </code></pre>
  
  <p>thanks in advance
  Wolfgang R.</p>