IP Packet structure 4-bit 4-bit 8-bit Version header Type of Service 16-bit Total Length(Bytes) Length (TOS) 3-bit 16-bit Identification Flace 1 13-bit Fragment Offset Specifies the length of the entire 8-bit Time to 8-bit Protocol Live (TTL) IP packet: bytes in this header plus bytes in the Payload 32-bit Source P Address 32-bit Destination IP Address Options (if any) PayloadIP Packet Structure 4-bit Version 4-bit Header Length 8-bit Typeof Service (TOS) 16-bit Total Length (Bytes) 16-bit Identification 3-bit Flags 16-bit Header Checksum 13-bit Fragment Offset 8-bit Time to Live (TTL) 8-bit Protocol 32-bit Source IP Address 32-bit Destination IP Address Options (if any) Specifies the length of the entire IP packet: bytes in this header plus bytes in the Payload Payload