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IPv6 and the Domain Name System
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IPv6 addresses are four times larger than IPv4 addresses, so they are represented in DNS forward-lookup zones by AAAA records, or quad-A records Here is an example of an IPv6 host record:
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The IPv6ARPA domain has been created for IPv6 reverse queries Also called pointer queries, reverse queries determine a host name based on the IP address To create the namespace for reverse queries, each hexadecimal digit in the fully expressed 32-digit IPv6 address becomes a separate level, in inverse order and in the reverse domain hierarchy For example, the reverse lookup domain name for the address:
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2001:0:4136:e378:3000:3dd3:3f56:ffa4
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Computers that use both IPv4 and IPv6 might not be able to resolve names and connect to Internet resources if DNS servers are configured incorrectly When a misconfigured DNS server receives a request to resolve a name to an IPv6 addresses and the DNS server does not support IPv6, the name query will fail A subsequent request for an IPv4 version of the record is requested, but the misconfigured DNS server will drop the subsequent DNS query for IPv4 addresses and the entire name resolution
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attempt will fail, resulting in impaired network connectivity for the requesting node If you are experiencing this problem, ask your DNS administrator to reconfigure his or her DNS server to accept the subsequent DNS query for A records after failing the DNS query for AAAA records
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IPv6 in Vista
More great news for IPv6 fans is that it is already highly integrated into the Microsoft platform The capture and parsing of IPv6 traffic is supported by Microsoft Network Monitor, found in Systems Management Server (SMS) version 20 and Windows Server 2003 Within the Microsoft platform, you can use IPv6 without affecting IPv4 communications IPv6 hosts are all logically multihomed, with at least two addresses with which they can receive packets a link-local address for local link traffic and either a routable sitelocal or a global address, depending on the routing infrastructure By default, every host is addressable and receives traffic on these multicast addresses: The interface-local scope all-nodes multicast address (FF01::1) The link-local scope all-nodes multicast address (FF02::1) The solicited-node address for each unicast address on each interface The multicast addresses of joined groups on each interface
An IPv4 host typically has a single IPv4 address assigned to each network interface In contrast, IPv6 hosts have several IPv6 addresses for each interface IPv6 hosts are assigned these unicast addresses: A link-local address for each interface Unicast addresses for each interface (which could be a site-local address and one or multiple global unicast addresses) The loopback address (::1) for the loopback interface
Figure 4-10 illustrates the multiple addresses assigned in a workgroup environment Configuration In Windows XP and Windows Server 2003, you manually configure IPv6 using netsh interface IPv6 commands Vista allows you to also configure IPv6 settings through the properties of the IPv6 component in the Connections And Adapters folder MLDv2 Vista supports Multicast Listener Discovery version 2 (MLDv2), specified in RFC 3810, which allows IPv6 hosts to register interest in source-specific multicast traffic with their local multicast routers LLMNR Vista also supports Link-Local Multicast Name Resolution (LLMNR), which allows for name resolution without a DNS server for IPv6-enabled interfaces This capability is useful for single-subnet networks and ad hoc wireless networks Workstations with LLMNR send their DNS queries to a multicast address on which
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Figure 4-10 IPv6 and IPv4 addresses for a sample host
all the LLMNR-capable nodes of the subnet are listening The destination owner sends a unicast response to the source host IPv4 nodes can also use LLMNR instead of NetBIOS lookups IPv6 over PPP Vista s remote-access client supports IPv6 over the Point-to-Point Protocol (PPP) Referred to as PPPv6, it is defined in RFC 2472 PPPv6 support allows you to connect with an IPv6-based Internet service provider (ISP) through either dial-up or PPP over Ethernet (PPPoE) PPPv6 also supports L2TP, which is used for VPN connections DHCPv6 The DHCP client service in Vista supports Dynamic Host Configuration Protocol for IPv6 (DHCPv6) This new version of DHCP is defined in RFCs 3315 and 3736 Vista IPv6 workstations can negotiate both stateful and stateless DHCPv6 configuration on IPv6 networks Random Interface IDs To prevent address scans of IPv6 addresses based on well-known interface ID roots, Vista will, by default, generate random interface IDs for permanent, autoconfigured IPv6 addresses, including public and link-local addresses A public IPv6 address is a global address that is registered in DNS and is typically used by server applications for incoming connections, such as a Web server Note that this new behavior is different than that for temporary IPv6 addresses, as described in RFC 3041 Temporary addresses also use randomly derived interface IDs However, they are not registered in DNS and are typically used by client applications
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