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For more detailed information on Ip concepts, features, and terminology, see the
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white paper titled Introduction to Ip Version 6 at http://www.microsoft.com/downloads /details.aspx FamilyID=CbC0b8A3-b6A4-4952-bbE6-D976624C257C&displaylang=en. another good reference for learning Ipv6 is the book, Understanding IPv6, 2nd Edition, by Joseph Davies (Microsoft press, 2008).
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Understanding Ipv6 Terminology
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The following terminology is used to define IPv6 concepts and describe IPv6 features:
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Node An IPv6-enabled network device that includes both hosts and routers . Host An IPv6-enabled network device that cannot forward IPv6 packets that are not explicitly addressed to itself . A host is an endpoint for IPv6 communications (either the source or destination) and drops all traffic not explicitly addressed to it . Router An IPv6-enabled network device that can forward IPv6 packets that are not explicitly addressed to itself . IPv6 routers also typically advertise their presence to IPv6 hosts on their attached links . link One or more LAN (such as Ethernet) or wide area network (WAN, such as Pointto-Point Protocol [PPP]) network segments bounded by routers . Like interfaces, links may be either physical or logical . Neighbors Subnet Nodes that are connected to the same physical or logical link . One or more links having the same 64-bit IPv6 address prefix .
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Interface A representation of a node s attachment to a link . This can be a physical interface (such as a network adapter) or a logical interface (such as a tunnel interface) .
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an Ipv6 address identifies an interface, not a node. a node is identified by having
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one or more unicast Ipv6 addresses assigned to one of its interfaces.
Understanding Ipv6 addressing
IPv6 uses 128-bit (16-byte) addresses that are expressed in colon-hexadecimal form . For example, in the address 2001:DB8:3FA9:0000:0000:0000:00D3:9C5A, each block of 4-digit hexadecimal numbers represents a 16-bit digit binary number . The eight blocks of four-digit hexadecimal numbers thus equal 8 16 = 128 bits in total . You can shorten colon-hexadecimal addresses by suppressing leading zeros for each block . Using this technique, the representation for the preceding address now becomes 2001:DB8:3FA9:0:0:0:D3:9C5A . You can shorten colon-hexadecimal addresses even further by compressing contiguous 0 (hex) blocks as double colons ("::") . The address in this example thus shortens to 2001:DB8:3FA9::D3:9C5A . Note that only one double colon can be used per IPv6 address to ensure unambiguous representation .
Understanding Ipv6 prefixes
An IPv6 prefix indicates the portion of the address used for routing (a subnet or a set of subnets as a summarized route) or for identifying an address range . IPv6 prefixes are expressed in a manner similar to the Classless Inter-Domain Routing (CIDR) notation used by IPv4 . For example, 2001:DB8:3FA9::/48 might represent a route prefix in an IPv6 routing table . In IPv4, CIDR notation can be used to represent individual unicast addresses in addition to routes and subnets . IPv6 prefixes, however, are used only to represent routes
Understanding IPv6 CHapTER 28
and address ranges, not unicast addresses . Unlike IPv4, IPv6 does not support variablelength subnet identifiers, and the number of high-order bits used to identify a subnet in IPv6 is almost always 64 . It is thus redundant to represent the address in our example as 2001:DB8:3FA9::D3:9C5A/64; the /64 portion of the representation is understood .
Understanding Ipv6 address Types
IPv6 supports three different address types:
Unicast Identifies a single interface within the scope of the address . (The scope of an IPv6 address is that portion of your network over which this address is unique .) IPv6 packets with unicast destination addresses are delivered to a single interface . Multicast Identifies zero or more interfaces . IPv6 packets with multicast destination addresses are delivered to all interfaces listening on the address . (Generally speaking, multicasting works the same way in IPv6 as it does in IPv4 .) Anycast Identifies multiple interfaces . IPv6 packets with anycast destination addresses are delivered to the nearest interface (measured by routing distance) specified by the address . Currently, anycast addresses are assigned only to routers and can only represent destination addresses .
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