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 Flags 13-bit Fragment Offset 8-bit time to Live(TTL) 8-bit Protocol 16-bit Header Checksum 32-bit Source IP Address 32-bit Destination IP Address Options (if any) PayloadIP Packet Structure 4-bit 4-bit 8-bit Version Header Typeof Service 16-bit Total Length (Bytes) Length (TOS) 3-bit 16-bit Identification Flags 13-bit Fragment Offset 8-bit Time to Live (TTL) 8-bit Protocol 16-bit Header Checksum 32-bit Source IP Address 32-bit Destination IP Address Options (if any) Payload