To support the increasing number of IPv6 and dual-stack networks, Infoblox DNS servers now support DNS64, a mechanism that synthesizes AAAA records from A records when no AAAA records exist. When you enable DNS64 on an Infoblox DNS server, it can operate with a third-party NAT64 device so IPv6-only nodes can communicate with IPv4-only nodes without any changes to either of the devices.
As illustrated in Figure 17.3 , when an IPv6-only host requests the AAAA record of an IPv4-only server and none exists, a DNS64-enabled server can retrieve the A record of the IPv4 server and synthesize an AAAA record. The IPv6-only host can then use the synthesized AAAA record, which contains the IPv6 proxy address for the IPv4 address in the original A record, to initiate communication with the IPv4 host.
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Following are the steps illustrated in Figure 17.3 :
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