On Tue, Oct 24, 2006 at 11:29:46AM +0200, Shane Kerr wrote:
> In IPv6, the ISP has no knowledge of which of the 2^64 or 2^80 addresses given
> to each customer is actually used for which purpose. This is why I suggest
> that
> for reverse DNS to work in IPv6 you need to either delegate to a DNS server
> that
> is at the customer site or provide some way to update the DNS information at
> the
> ISP's server.
So would a note to the following effect address your concern (say, in
section 3.2 of the doc):
IPv6 reverse mapping is conceptually the same as IPv4 reverse
mapping, but operators are reminded that, depending on details of
address and DNS management, it may be more complicated to ensure
that reverse mapping remains accurate under IPv6. In particular,
operators are urged to consider the number of addresses each
customer might have when developing a scheme to support reverse
entries. Administrators are advised to consider the potential
for inaccuracy (or generic entries) in large blocks of IPv6 space
when contemplating using reverse-mapping tests.
?
A
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