title: how wireshark marks some packets as "tcp segment of a reassembled pdu"
body: <p>I opened a pcap in wireshark and it displays a lot of packets as "tcp segment of a reassembled pdu". How wireshark is able to determine which tcp packets are segments of a reassembled pdu ? I am not able to find any header field or anything else by which wireshark can determine this. </p>
  
  <p>Any help will be greatly appreciated. THANKS !!!</p>