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Cisco Self-Study: Implementing IPv6 Networks (IPV6) by Régis Desmeules

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Domain Name System (DNS)

The IETF has defined new Domain Name System (DNS) resource record types for IPv6 addresses. This section discusses AAAA and PTR records, which are used for IPv6 addresses in DNS servers.

AAAA Records

In IPv4, the A resource record maps a host name to an IPv4 address. Similarly, the AAAA resource record maps a host name to an IPv6 address. Table 3-9 shows two examples of different resource records using the same fully qualified domain name (FQDN).

Table 3-9. DNS Resource Records for IPv4 and IPv6
ProtocolRecordDNS Mapping
IPv4Awww.example.org A 206.123.31.200
IPv6AAAAwww.example.org AAAA 2001:410:1:1:250:3EFF:FEE4:1

The AAAA record has been available since release 4.9.4 of the ISC Berkeley Internet Name Domain (BIND) software. ...

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