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CIDR notation isĪ slash at the end of the address that is followed by
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Prefix length is stated in classless inter-domain routing (CIDR) notation. The leftmost fields of the IPv6 address contain the prefix, which is usedįor routing IPv6 packets. You can use the two colon notation to replace any contiguous fields ofĪll zeros in the IPv6 address. In a field, such as changing 0db8 to db8. Other fields of zeros canīe represented as a single 0. In Figure 3-2 by replacing the two contiguous fields of zeros in the interface For example, you might abbreviate the IPv6 address The IPv6 addressing architecture allows you use the two-colon (::) notation to representĬontiguous 16-bit fields of zeros. This condition results in fields that are padded with zeros or contain only Most IPv6 addresses do not occupy all of their possible 128 bits. The lower order, rightmost 64 bits, 0000:0000:1a2f:1a2b, contain the interface ID. The nextġ6 bits, 0015, contain the subnet ID, representing the private topology for the The firstĤ8 bits, 2001:0db8:3c4d, contain the site prefix, representing the public topology. This example shows all 128 bits of an IPv6 address. The interface ID is either automatically configured from the interface's MACĪddress or manually configured in EUI-64 format.Ĭonsider again the address in Figure 3-2: The rightmost four fields (64 bits) contain the interface ID, also referred to asĪ token. Site topology, because it is internal to your site. The subnet ID describes the private topology, also known as the The next field is the 16-bit subnet ID, which you (or another administrator) allocateįor your site. Public topology that is usually allocated to your site by an ISP or The leftmost three fields (48 bits) contain the site prefix. The next figure, the x's represent hexadecimal numbers. Each field must containĪ hexadecimal number, in contrast to the dotted-decimal notation of IPv4 addresses. Parts of the IPv6 AddressĪn IPv6 address is 128 bits in length and consists of eight,ġ6-bit fields, with each field bounded by a colon. Packets that are sent to the anycast address go to the anycast group member node that is physically closest to the sender. Identifies a group of interfaces, usually on different nodes. Packets that are sent to the multicast address go to all members of the multicast group.
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Identifies an interface of an individual node. IPv6 defines three address types: unicast Note - For complete technical information about the IPv6 address format, go to RFC 2374,
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