| Bytes | Description |
| 0 | bits 0-3: Version, bits 4-7: Internet Header Length (IHL) |
| 1 | Type of service (TOS) |
| 2-3 | Length |
| 4-5 | Identification |
| 6-7 | bits 0-3: Flags, bits 4-15: Offset |
| 8 | Time to live (TTL) |
| 9 | Type |
| 10-11 | Checksum |
| 12-15 | Source IP address |
| 16-19 | Destination IP address |
| 20-IHL*4-1 | Options + padding to round up to four bytes |
| 0-1 | Source Port |
| 2-3 | Destination Port |
| 4-7 | Sequence Number |
| 8-11 | Acknowledgement Number |
| 12 | bits 0-3: number of bytes of additional TCP Options / 4 |
| 13 | Control |
| 14-15 | Window |
| 16-17 | Checksum |
| 18-19 | Urgent Pointer |
| 20-20+Options*4 | Options + padding to round up to four bytes |
| TCP Data begins at IHL*4+20+Options*4 and ends at Length-1 | |
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source:http://linuxpoison.blogspot.com/2008/09/13578175718364.html