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IPv6 and DNS
One of the most pressing challenges facing anyone who wishes to deploy
IPv6 is that of deploying Domain Name System (DNS) servers that are
able to correctly respond to requests for domain name resolution for both
IPv6 and IPv4 nodes. As long as DNS can be relied on to provide accu-
rate linking of IP addresses for domain names, IPv6 nodes can be linked
seamlessly and transparently to the application layer and the end user
(and, to a great extent, to the transport layer).
DNS is a very distributed database system that defines a variety of different
resource records (RRs) to correspond to different types of data. For example,
the A RR