Many network error detection and correction techniques are based on checksums. The sender performs a computation on the data to be sent and the result, the checksum, is included with the transmission. The receiver performs the same computation on the data it receives and compares its results to the sender’s checksum. If a difference exists, the data is most likely corrupted and the sender is asked to retransmit the data.

The Checksums analysis module verifies checksums and keeps track of the total number of invalid checksums for IP headers and data (including ICMP, IGMP, TCP, and UDP). Invalid checksums can be displayed in capture windows. This analysis module can send notifications.