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23 An IPv4 datagram has arrived with the following information in the header (in hexadecimal):
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Ox45 00 00 54 00 03 58 50 20 06 00 00 7C 4E 03 02 B4 OE OF 02
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Is the packet corrupted Are there any options Is the packet fragmented What is the size of the data How many more routers can the packet travel to f What is the identification number of the packet g What is the type of service 24 In an IPv4 datagram, the M bit is 0, the value of HLEN is 5, the value of total length is 200, and the offset value is 200 What is the number of the first byte and number of the last byte in this datagram Is this the last fragment, the first fragment, or a middle fragment
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25 Find out why there are two security protocols (AH and ESP) in IPv6
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Network Layer: Address Mapping, Error Reporting, and Multicasting
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In 20 we discussed the Internet Protocol (IP) as the main protocol at the network layer IP was designed as a best-effort delivery protocol, but it lacks some features such as flow control and error control It is a host-to-host protocol using logical addressing To make IP more responsive to some requirements in today's intemetworking, we need the help of other protocols We need protocols to create a mapping between physical and logical addresses IP packets use logical (host-to-host) addresses These packets, however, need to be encapsulated in a frame, which needs physical addresses (node-to-node) We will see that a protocol called ARP, the Address Resolution Protocol, is designed for this purpose We sometimes need reverse mapping-mapping a physical address to a logical address For example, when booting a diskless network or leasing an IP address to a host Three protocols are designed for this purpose: RARP, BOOTp, and DHCP Lack of flow and error control in the Internet Protocol has resulted in another protocol, ICMP, that provides alerts It reports congestion and some types of errors in the network or destination host IP was originally designed for unicast delivery, one source to one destination As the Internet has evolved, the need for multicast delivery, one source to many destinations, has increased tremendously IGMP gives IP a multicast capability In this chapter, we discuss the protocols ARP, RARP, BOOTP, DHCP, and IGMP in some detail We also discuss ICMPv6, which will be operational when IPv6 is operational ICMPv6 combines ARP, ICMP, and IGMP in one protocol
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ADDRESS MAPPING
An internet is made of a combination of physical networks connected by internetworking devices such as routers A packet starting from a source host may pass through several different physical networks before finally reaching the destination host The hosts and routers are recognized at the network level by their logical (IP) addresses However, packets pass through physical networks to reach these hosts and routers At the physical level, the hosts and routers are recognized by their physical addresses
NETWORK LAYER: ADDRESS MAPPING, ERROR REPORTING, AND MULTICASTING
A physical address is a local address Its jurisdiction is a local network It must be unique locally, but is not necessarily unique universally It is called a physical address because it is usually (but not always) implemented in hardware An example of a physical address is the 48-bit MAC address in the Ethernet protocol, which is imprinted on the NIC installed in the host or router The physical address and the logical address are two different identifiers We need both because a physical network such as Ethernet can have two different protocols at the network layer such as IP and IPX (Novell) at the same time Likewise, a packet at a network layer such as IP may pass through different physical networks such as Ethernet and LocalTalk (Apple) This means that delivery of a packet to a host or a router requires two levels of addressing: logical and physical We need to be able to map a logical address to its corresponding physical address and vice versa These can be done by using either static or dynamic mapping Static mapping involves in the creation of a table that associates a logical address with a physical address This table is stored in each machine on the network Each machine that knows, for example, the IP address of another machine but not its physical address can look it up in the table This has some limitations because physical addresses may change in the following ways:
1 A machine could change its NIC, resulting in a new physical address 2 In some LANs, such as LocalTalk, the physical address changes every time the computer is turned on 3 A mobile computer can move from one physical network to another, resulting in a change in its physical address To implement these changes, a static mapping table must be updated periodically This overhead could affect network performance In dynamic mapping each time a machine knows one of the two addresses (logical or physical), it can use a protocol to find the other one
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