Checksum TCP

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Pseudo TCP header
Source Address
Destination Address
0 0 0 0 0 0 0 0 Proto TCP-Length
TCP Header
Source Port Destination Port
Sequence Number
Acknowledge Number
Offset Reserved Flags Window
Checksum = 0000000000000000 Urgent Pointer
Options Paddings
Data
Pseudo TCP header
Source Address
Destination Address
0 0 0 0 0 0 0 0 Proto TCP-Length
TCP Header
Source Port Destination Port
Sequence Number
Acknowledge Number
Offset Reserved Flags Window
Checksum = 0000000000000000 Urgent Pointer
Options Paddings
Data