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Three transition strategies
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NETWORK LAYER: INTERNET PROTOCOL
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It is recommended that all hosts, before migrating completely to version 6, have a dual stack of protocols In other words, a station must run IPv4 and IPv6 simultaneously until all the Internet uses IPv6 See Figure 2019 for the layout of a dual-stack configuration
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Figure 2019 Dual stack
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IPv6
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To IPv4 syste m
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To IPv6 system
To determine which version to use when sending a packet to a destination, the source host queries the DNS If the DNS returns an IPv4 address, the source host sends an IPv4 packet If the DNS returns an IPv6 address, the source host sends an IPv6 packet
Tunneling
Thnneling is a strategy used when two computers using IPv6 want to communicate with each other and the packet must pass through a region that uses IPv4 To pass through this region, the packet must have an IPv4 address So the IPv6 packet is encapsulated in an IPv4 packet when it enters the region, and it leaves its capsule when it exits the region It seems as if the IPv6 packet goes through a tunnel at one end and emerges at the other end To make it clear that the IPv4 packet is carrying an IPv6 packet as data, the protocol value is set to 41 Tunneling is shown in Figure 2020
Figure 2020 Tunneling strategy
IPv6 host
&-------ieDlIS: ~_----llii~~------t 1It:i
IPv4region
;;:tt-------&
IPv6 host
SECTION 205
RECOMMENDED READING
Header Translation
Header translation is necessary when the majority of the Internet has moved to IPv6 but some systems still use IPv4 The sender wants to use IPv6, but the receiver does not understand IPv6 Tunneling does not work in this situation because the packet must be in the IPv4 format to be understood by the receiver In this case, the header format must be totally changed through header translation The header of the IPv6 packet is converted to an IPv4 header (see Figure 2021)
Header translation strategy
&-----;'l ~~I-----_cO~---,
IPv6 regioll
IPv6 host
1I:i
iii i:!II,t------&
IPv4 host
Header translation done here
Header translation uses the mapped address to translate an IPv6 address to an IPv4 address Table 2011 lists some rules used in transforming an IPv6 packet header to an IPv4 packet header Table 2011
Header translation Header Translation Procedure
1 The IPv6 mapped address is changed to an IPv4 address by extracting the rightmost 32 bits 2 The value of the IPv6 priority field is discarded 3 The type of service field in IPv4 is set to zero 4 The checksum for IPv4 is calculated and inserted in the corresponding field 5 The IPv6 flow label is ignored 6 Compatible extension headers are converted to options and inserted in the IPv4 header Some may have to be dropped 7 The length of IPv4 header is calculated and inserted into the corresponding field 8 The total length of the IPv4 packet is calculated and inserted in the corresponding field
RECOMMENDED READING
For more details about subjects discussed in this chapter, we recommend the following books and sites The items in brackets [] refer to the reference list at the end of the text
NETWORK LAYER: INTERNET PROTOCOL
Books
IPv4 is discussed in 8 of [For06], 3 of [Ste94J, Section 41 of [PD03], 18 of [Sta04], and Section 56 of [Tan03] IPv6 is discussed in 27 of [For06] and [Los04]
Sites
wwwietforg/rfchtml Information about RFCs
RFCs
A discussion of IPv4 can be found in following RFCs:
760,781,791,815,1025,1063,1071,1141,1190, 1191, 1624,2113
A discussion of IPv6 can be found in the following RFCs:
1365,1550,1678,1680,1682,1683,1686,1688,1726, 1752, 1826, 1883, 1884, 1886, 1887, 1955,2080,2373,2452,2463,2465,2466,2472,2492,2545,2590
KEY TERMS
header translation hop limit hop-by-hop option Internet Protocol (IP) Internet Protocol, next generation (IPng) Internet Protocol version 4 (IPv4) Internet Protocol version 6 (IPv6) jumbo payload loose source route option maximum transfer unit (MTU) next header noncongestion-controlled traffic no-operation option packet priority Padl PadN path MTU discovery technique precedence
authentication base header best-effort delivery codepoint connectionless service connection-oriented service datagram destination address destination option differentiated services dual stack encrypted security payload (ESP) end-of-option option extension header flow label fragmentation fragmentation offset header length
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