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An IPv6 packet is the smallest message entity exchanged using Internet Protocol version 6 (IPv6). Packets consist of control information for addressing and routing and a payload of user data. The control information in IPv6 packets is subdivided into a mandatory fixed header and optional extension headers.
The 128 highest addresses within each / 64 subnet prefix are reserved to be used as anycast addresses. [27] These addresses usually have the first 57 bits of the interface identifier set to 1, followed by the 7-bit anycast ID. Prefixes for the network can be of any length for routing purposes, but subnets are required to have a length of 64 bits.
The current use of the IPv6 Traffic Class field divides this between a 6 bit Differentiated Services Code Point [34] and a 2-bit Explicit Congestion Notification field. [ 35 ] Extension headers carry options that are used for special treatment of a packet in the network, e.g., for routing, fragmentation, and for security using the IPsec framework.
The Link-Local Multicast Name Resolution (LLMNR) is a protocol based on the Domain Name System (DNS) packet format that allows both IPv4 and IPv6 hosts to perform name resolution for hosts on the same local link. It is included in Windows Vista, Windows Server 2008, Windows 7, Windows 8, Windows 10. [1]
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Windows NT (includes Windows 10 Mobile, and Xbox One onwards) 5.1 Yes No Add-on [9] No Windows XP users can use Dibbler, an open source DHCPv6 implementation. --update: Windows XP fully supports IPv6- but NOT IPv6 DNS queries (nslookup) [30] 6.x (Vista, 7, 8, 8.1), 10 RTM-Anniversary Update: Yes [31] Yes Yes [9] No
A Cryptographically Generated Address is an IPv6 address whose interface identifier has been generated according to the CGA generation method. The interface identifier is formed by the least-significant 64 bits of an IPv6 address and is used to identify the host's network interface on its subnet.
The Dynamic Host Configuration Protocol version 6 (DHCPv6) is a network protocol for configuring Internet Protocol version 6 (IPv6) hosts with IP addresses, IP prefixes, default route, local segment MTU, and other configuration data required to operate in an IPv6 network.