Typical IP Packet
The figure represents a complete IP packet with typical header field values.
Ver = 4; IP version.
IHL = 5; size of header in 32 bit words (4 bytes). This header is 5*4 = 20 bytes, the minimum valid size.
Total Length = 472; size of packet (header and data) is 472 bytes.
Identification = 111; original packet identifier (required if it is later fragmented).
Flag = 0; denotes packet can be fragmented if required.
Fragment Offset = 0; denotes that this packet is not currently fragmented (there is no offset).
Time to Live = 123; denotes the Layer 3 processing time in seconds before the packet is dropped (decremented by at least 1 every time a device processes the packet header).
Protocol = 6; denotes that the data carried by this packet is a TCP segment .
The figure represents a complete IP packet with typical header field values.
Ver = 4; IP version.
IHL = 5; size of header in 32 bit words (4 bytes). This header is 5*4 = 20 bytes, the minimum valid size.
Total Length = 472; size of packet (header and data) is 472 bytes.
Identification = 111; original packet identifier (required if it is later fragmented).
Flag = 0; denotes packet can be fragmented if required.
Fragment Offset = 0; denotes that this packet is not currently fragmented (there is no offset).
Time to Live = 123; denotes the Layer 3 processing time in seconds before the packet is dropped (decremented by at least 1 every time a device processes the packet header).
Protocol = 6; denotes that the data carried by this packet is a TCP segment .
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