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The Loopback Address
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The address 0000:0000:0000:0000:0000:0000:0000:0001 is also called the loopback address (its compressed form is ::1), and it is used by a node to send an IPv6 packet to itself It must never be assigned to any interface A node must never transmit outside itself any IPv6 packets with a loopback address as the source or destination address
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The transition mechanism from IPv4 to IPv6 includes a mechanism to dynamically tunnel IPv6 packets over the IPv4 routing infrastructure (See 12 for details about the transition to IPv6) IPv6 nodes that use this technique are assigned special IPv6 unicast addresses that carry an IPv4 address in the low-order 32 bits, as shown in Figure 4-10 These addresses are called IPv4-compatible IPv6 addresses An example of this type of address is the following:
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A second type of IPv6 address that holds an embedded IPv4 address is called an IPv4-mapped IPv6 address (see Figure 4-11) This second type of address is used to represent the address of an IPv4-only node in IPv6 An example of this type of address is the following:
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Today, the use of IPv6 addresses derived from ISO/OSI NSAP (FP = 0000 001) addresses is still under consideration, and a proposal in this direction is specified by RFC 1888 4 NSAP addresses are binary strings up to
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Figure 4-10 IPv4-compatible IPv6 address
Figure 4-11 IPv4-mapped IPv6 address
Four
20 octets long defined in the OSI project by the standard ISO 8348 12 In the past, they held a certain interest because some organizations decided to adopt the layer 3 connectionless protocol ISO 8473 11, which uses these addresses NSAP addresses allow seven possible subformats, most of which are obsolete Three subformats have been resumed and are used currently by the ATM 13 to address layer 2 ATM stations; they are illustrated in Figure 4-12 At first glance, we can see that deriving IPv6 addresses starting from NSAP addresses (see Figure 4-13) clearly creates some problems because NSAP addresses (160 bits) are longer than IPv6 addresses (128 bits) These problems have three possible solutions: 1 To create a rule to map NSAP fields into IPv6 address fields; this solution is possible because not all NSAP fields have been used 2 To truncate the NSAP and use it for routing while the complete NSAP address is transported inside a Destination option (see Section 328); for this purpose, a NSAPA option has been defined and is identified by the value 195 in the Option Type field (see Section 322) 3 To use a normal IPv6 address for the routing and to transport the complete NSAP inside a Destination option as in the previous case Considering the limited impact that, in our honest opinion, these types of addresses will have in the future, we will not discuss them further here For a more detailed treatment, see RFC 1888 4
Figure 4-12 The three NSAP formats used by the ATM
IPv6 Addresses
Figure 4-13 IPv6 address drawn from a NSAP address
4610 IPX Addresses
The network operating system Novell Netware is undoubtedly one of the most diffused in the field of PC networks This network software can support several layer 3 (network) protocols, but the preferential protocol is Internetwork Packet Exchange (IPX) 14 IPX is a connectionless protocol that assigns addresses to interfaces and is therefore very similar to IP Addresses, which have the format shown in Figure 4-14, consist of two parts: Six octets contain the interface address (very frequently the MAC address), and four octets contain the segment ID The concept of segments is similar to the concept of subnets in IP Because an IPX address is globally 80 bits long, implementing a relationship with IPv6 addresses (FP = 0000 010) that have 121 bits available for this purpose creates no problems (see Figure 4-15) Nevertheless, at present no standard specifies how to implement this solution
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