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For [IPv6] there are two types of [DNS] address format, [AAAA] and [A6]. [AAAA] is the simple one -it works just like an [A] record in [IPv4], but with more bits. [A6] supports fragments of [IPv6] addresses. You can say "example.com" has the fragment "2002:c000:0201", "engineering.example.com" has "the example.com fragment" + ":0001", and "foo.engineering.example.com" has "the engineering prefix" + ":0000:0000:0000:0001". This means that when example.com renumbers, they change one [DNS] record (example.com) and all of their machines have been renumbered. Some people complain that [A6] is too complicated, and prone to problems (What is the [TTL] on the response if the fragments all have different lifetimes? What's the status of it if some of the entries (but not all of them) are signed with [DNSSEC]? What protection is there against DoS?) The [A6] people say that it's necessary for networks that regularly change IP address (eg: networks that use a dynamic 6to4 address). [A6] in general is the newer standard, and [AAAA] is the older standard, however, there doesn't yet appear to be much momentum for [A6] support. ----- CategoryNetworking
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