IPv6 support introduces several changes to how host name and IP address resolution is performed. These changes affect several areas of resolver processing, including:

• New resolver APIs are introduced for IPv6-enabled applications. For more information, see Name and address resolution functions.
• New DNS IPv6 AAAA records are defined in place of DNS IPv4 A records to represent hosts with IPv6 addresses, resulting in new network flows between resolvers and name servers.
• A new algorithm is defined to describe how a resolver needs to sort a list of IP addresses returned for a multihomed host. For more information, see Default destination address selection.
• New statements in the resolver configuration files are defined, and new search orders are implemented for local host tables processing.