Checksum

Covers the header, the data, and a pseudo-header built from the IP addresses above.

Reading a capture

Reaches up a layer to include IP addresses, which is why it cannot be verified without knowing what is in the lane above. The sample coherence check does exactly that.

Where it sits

TCP Segment > Checksum

• Open in the explorer — TCP over IPv4, in a protected QoS Data frame, aggregated
• Open in the explorer — TCP over IPv4, in a protected QoS Data frame
• Open in the explorer — TCP over IPv4, in an open QoS Data frame

Accuracy

Clause

RFC 9293 §3.1

Byte order

big-endian — network byte order

Verified

Not verified against the standard. Treat this as a claim, not a fact.