Identification Field

Total Length in bytes (16)

Time to Live (8)

Options (if any)

Version

(4)

Hdr Len

(4)

TOS (8)

Indication (16 bits)

Flags (3)

Fragment Offset (13)

Source IP Address

Destination IP Address

Header Checksum (16)

Protocol (8)

PAD

Data Field

IP packet has a 16-bit Identification field