title: Filter ACK packets
body: <p>I have the following <code>tcpdump -i eth0 -w pkts.pcap -n tcp port 5000</code> to filter every packet flowing between 2 hosts. However, one of the hosts always sends an ACK.</p>
  
  <p>How do I filter the ACKs too, so my pkts.pcap does not show them?</p>