title: Scapy: eth_boundary option returns IndexError: Layer [14] not found
body: <p>I'm missing something while setting eth_boundary option.</p>
  
  <pre><code>&gt;&gt;&gt; eth_boundary=14
  &gt;&gt;&gt; pkt=e/i
  &gt;&gt;&gt; len(e)
  14
  &gt;&gt;&gt; len(i)
  20
  &gt;&gt;&gt;
  &gt;&gt;&gt; pkt.show()
  ###[ Raw ]###
    load= '\x00\xa0\xa1\x12\xc2\xc1\x001H\xcd\xe8\x5c\x08\x00E\x00\x00\x11\x00\x01\x00\x00@\x00P\xe2\x11\x01\x01\x02\x14\x01\x01\x01'
  
  &gt;&gt;&gt; pkt[eth_boundary:]
  Traceback (most recent call last):
    File "/usr/lib/python3.5/code.py", line 91, in runcode
      exec(code, self.locals)
    File "&lt;console&gt;", line 1, in &lt;module&gt;
    File "/home/regress/scapy/scapy/packet.py", line 1171, in __getitem__
      raise IndexError("Layer [%s] not found" % lname)
  IndexError: Layer [14] not found
  &gt;&gt;&gt;
  </code></pre>
  
  <p>Please help me out on how to fix the above error.</p>