title: Why is listening on port with Netcat not working
body: <p>I am running the following command on Ubuntu:</p>
  
  <pre><code>nc -l -p 5004 -v  &gt;&gt; /home/anders/Dropbox/netcatFiles/test
  </code></pre>
  
  <p>which includes a command to make it listen at 5004.</p>
  
  <p>I am sending a RTP-stream to port 5004 using VLC. When I am observing the loopback-interface in Wireshark I notice ICMP-packets with the message 'Destination unreachable'.</p>
  
  <p>Opening another VLC and telling it to play the incoming data at port 5004, it all works, and the stream is played.</p>
  
  <p>What should I do in order to get Netcat to listen at port 5004?</p>