Received a packet capture file with this message. The reason is ·tcpdump· by default capture packet of only 96 bytes. Larger ones are truncated.
The solution is to capture with
tcpdump -i eth0 -w out.pcap -s 0
-s 0 flag tell tcpdump to capture packet at original size (65535 bytes). And, this will create much larger output file.
See reference here.