Data Fields | |
| u_short | th_sport |
| Source port. | |
| u_short | th_dport |
| Destination port. | |
| u_long | th_seq |
| Sequence number of first octet in this segment. | |
| u_long | th_ack |
| Expected sequence number of next octet. | |
| u_char | th_x2:4 |
| Unused. | |
| u_char | th_off:4 |
| Unused Data offset. | |
| u_char | th_flags |
| Control flags. | |
| u_short | th_win |
| Number of acceptable octects. | |
| u_short | th_sum |
| 96 byte pseudo header checksum | |
| u_short | th_urp |
| Urgent data pointer. | |