12

16

20

24

28 Padding

1 2 Words 3 header 4 length 5

Source Port Sequence Number

Destination Port

Acknowledgement Number
URG ACK PSH

Reserved Checksum

RST SYN FIN

Window Urgent Pointer

Options (0 to 40 bytes) 5−15 Your data starts here

31

Bits

0

4

8