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The HLEN value is 8, which means the total number of bytes in the header is 8 x 4, or 32 bytes The first 20 bytes are the base header, the next 12 bytes are the options
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In an IPv4 packet, the value of HLEN is 5, and the value of the total length field is Ox0028 How many bytes of data are being carried by this packet
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The HLEN value is 5, which means the total number of bytes in the header is 5 x 4, or 20 bytes (no options) The total length is 40 bytes, which means the packet is carrying 20 bytes of data (40- 20)
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An IPv4 packet has arrived with the first few hexadecimal digits as shown Ox45000028000100000102 How many hops can this packet travel before being dropped The data belong to what upper-layer protocol
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To find the time-to-live field, we skip 8 bytes (16 hexadecimal digits) The time-to-live field is the ninth byte, which is 01 This means the packet can travel only one hop The protocol field is the next byte (02), which means that the upper-layer protocol is IGMP (see Table 204)
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Fragmentation
A datagram can travel through different networks Each router decapsulates the IPv4 datagram from the frame it receives, processes it, and then encapsulates it in another frame The format and size of the received frame depend on the protocol used by the physical network through which the frame has just traveled The format and size of the sent frame depend on the protocol used by the physical network through which the frame is going to travel For example, if a router connects a LAN to a WAN, it receives a frame in the LAN format and sends a frame in the WAN format
Maximum Transfer Unit (MTU)
Each data link layer protocol has its own frame format in most protocols One of the fields defined in the format is the maximum size of the data field In other words, when a datagram is encapsulated in a frame, the total size of the datagram must be less than this maximum size, which is defined by the restrictions imposed by the hardware and software used in the network (see Figure 209) The value of the MTU depends on the physical network protocol Table 205 shows the values for some protocols
NETWORK LAYER: INTERNET PROTOCOL
Figure 209 Maximum transfer unit (MTU)
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" M1lh ":Maximum li~gth of data to encapsulated~a' frame
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Table 205 MTUs for some networks
Protocol Hyperchannel Token Ring (16 Mbps) Token Ring (4 Mbps) FDDI Ethernet X25 MTU 65,535 17,914 4,464 4,352 1,500 576 296
To make the IPv4 protocol independent of the physical network, the designers decided to make the maximum length of the IPv4 datagram equal to 65,535 bytes This makes transmission more efficient if we use a protocol with an MTU of this size However, for other physical networks, we must divide the datagram to make it possible to pass through these networks This is called fragmentation The source usually does not fragment the IPv4 packet The transport layer will instead segment the data into a size that can be accommodated by IPv4 and the data link layer in use When a datagram is fragmented, each fragment has its own header with most of the fields repeated, but with some changed A fragmented datagram may itself be fragmented if it encounters a network with an even smaller MTU In other words, a datagram can be fragmented several times before it reaches the final destination In IPv4, a datagram can be fragmented by the source host or any router in the path although there is a tendency to limit fragmentation only at the source The reassembly of the datagram, however, is done only by the destination host because each fragment becomes an independent datagram Whereas the fragmented datagram can travel through different routes, and we can never control or guarantee which route a fragmented datagram may take, all the fragments belonging to the same datagram should finally arrive at the destination host So it is logical to do the reassembly at the final destination An even stronger objection to reassembling packets during the transmission is the loss of efficiency it incurs When a datagram is fragmented, required parts of the header must be copied by all fragments The option field mayor may not be copied, as we will see in the next section The host or router that fragments a datagram must change the values of three fields:
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