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Example 205
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A packet has arrived with an M bit value of O Is this the first fragment, the last fragment, or a middle fragment Do we know if the packet was fragmented
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If the M bit is 0, it means that there are no more fragments; the fragment is the last one However, we cannot say if the original packet was fragmented or not A nonfragmented packet is considered the last fragment
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Example 206
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A packet has arrived with an M bit value of 1 Is this the first fragment, the last fragment, or a middle fragment Do we know if the packet was fragmented
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If the M bit is 1, it means that there is at least one more fragment This fragment can be the first one or a middle one, but not the last one We don't know if it is the first one or a middle one; we need more information (the value of the fragmentation offset) See Example 207
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Example 207
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A packet has arrived with an M bit value of 1 and a fragmentation offset value of O Is this the first fragment, the last fragment, Or a middle fragment
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Because the M bit is l, it is either the first fragment or a middle one Because the offset value is 0, it is the first fragment
Example 208
A packet has arrived in which the offset value is 100 What is the number of the first byte Do we know the number of the last byte
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Solution
To find the number of the first byte, we multiply the offset value by 8 This means that the first byte number is 800 We cannot determine the number of the last byte unless we know the length of the data
Example 209
A packet has arrived in which the offset value is 100, the value of HLEN is 5, and the value of the tota1length field is 100 What are the numbers of the first byte and the last byte
Solution
The first byte number is 100 x 8 = 800 The total length is 100 bytes, and the header length is 20 bytes (5 x 4), which means that there are 80 bytes in this datagram If the first byte number is 800, the last byte number must be 879
Checksum
We discussed the general idea behind the checksum and how it is calculated in 10 The implementation of the checksum in the IPv4 packet follows the same principles First, the value of the checksum field is set to O Then the entire header is divided into 16-bit sections and added together The result (sum) is complemented and inserted into the checksum field The checksum in the IPv4 packet covers only the header, not the data There are two good reasons for this First, all higher-level protocols that encapsulate data in the IPv4 datagram have a checksum field that covers the whole packet Therefore, the checksum for the IPv4 datagram does not have to check the encapsulated data Second, the header of the IPv4 packet changes with each visited router, but the data do not So the checksum includes only the part that has changed If the data were included, each router must recalculate the checksum for the whole packet, which means an increase in processing time
Example 2010
Figure 2013 shows an example of a checksum calculation for an IPv4 header without options The header is divided into 16-bit sections All the sections are added and the sum is complemented The result is inserted in the checksum field
Options
The header of the IPv4 datagram is made of two parts: a fixed palt and a variable part The fixed part is 20 bytes long and was discussed in the previous section The variable part comprises the options that can be a maximum of 40 bytes Options, as the name implies, are not required for a datagram They can be used for network testing and debugging Although options are not a required part of the IPv4 header, option processing is required of the IPv4 software This means that all implementations must be able to handle options if they are present in the header The detailed discussion of each option is beyond the scope of this book We give the taxonomy of options in Figure 2014 and briefly explain the purpose of each
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