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Service Type Field
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The purpose of the Service Type field is to indicate how the datagram is processed Three of the eight bits in this field are used to denote the precedence or level of importance assigned by the sender Thus, this field proves a priority mechanism for the routing of IP datagrams
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Identification and Fragment Offset Fields
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The Identification field enables each datagram or fragmented datagram to be identified If a datagram is fragmented into two or more pieces, the Fragment Offset field specifies the offset in the original datagram of the data being transported Thus, this field indicates where a fragment belongs in the complete message The actual value in this field is an integer that corresponds to a unit of eight octets, providing an offset in 64-bit units
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It is important that security devices be able to recognize all fragments as members of the same datagram Some recent attacks exploit holes in firewall and router code that block the initial fragment of a data packet but allow the remaining fragments to pass through This attack takes advantage of the fact that the layer 4 header information is contained only in the first datagram fragment Once this fragment is blocked, if the blocking device does not keep a record of the discarded initial packet, it may mistakenly allow subsequent unauthorized fragments through Although an actual application connection cannot be established without the layer 4 header information in the initial fragment, an attacker might be able to create a denial of service attack by sending many fragmented datagrams to a particular host The host must hold the fragments in memory while it waits for all fragments to arrive, consuming valuable resources The specifics of this attack and its prevention will be covered in greater detail in later chapters
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The Time to Live (TTL) field specifies the maximum time that a datagram can exist This field prevents a misaddressed datagram from endlessly wandering the Internet or a private IP network Because an exact time is difficult to measure, it is commonly used as a hop count field In other words, routers decrement the value of this field by one as a datagram flows between networks If the value of the field reaches zero, the datagram is discarded
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The Flags field contains two bits that are used to denote how fragmentation occurs, with a third bit in the field presently unassigned The setting of one of the two fragmentation bits can be used as a direct fragment control mechanism because a value of 0 indicates the datagram can be fragmented, while a value of 1 indicates that it should not The second bit is set to 0 to indicate that a fragment in a datagram is the last fragment, while a value of 1 indicates more fragments follow
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The purpose of the Protocol field is to identify the higher level protocol used to create the message carried in the datagram For example, a value of decimal 6 would indicate TCP, while a value of decimal 17 would indicate UDP The 8-bit Protocol field enables protocols to be uniquely defined under IP version 4 Table 3 1 lists the current assignment of Internet protocol numbers Note that although TCP and UDP by far represent the vast majority of Internet traffic, other protocols can also be transported and a large block of protocol numbers are currently unassigned Under the evolving IP version 6, the Protocol field is named the Next Header field Table 3 1: Assigned Internet Protocol Numbers
Decimal
Keyword
Protocol
0 1 2 3 4 5 6
HOPOPT ICMP IGMP GGP IP ST TCP
IPv6 Hop-by-Hop Option Internet Control Message Internet Group Management Gateway-to-Gateway IP in IP (encapsulation) Stream Transmission Control Protocol CBT Exterior Gateway Protocol any private interior gateway (used by Cisco for their IGRP) BBN RCC Monitoring Network Voice Protocol Version 2 PUP ARGUS EMCON Cross Net Debugger Chaos User Datagram
7 8 9
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