Wireshark: Bad Checksum

If you select a line from your packet capture you can choose Analyze from the Menu and then Expert Info. This will provide a summary of the communication between two machines. A sequence of packets will be listed with the Protocol and a summary. In this example you see a repeated Error of a TCP Bad Checksum which may indicate, heavy traffic, a problem with a network card, etc. This would be an area to investigate further.

To get a summary of this problem select Analyze, Expert Info Composite. Here you will see the packet counts and the Chats will show the communication where the Bad checksums occurred. The Details shows the count numbers.