reverse dns for IPV6 ranges

[Spain, Dr. Jeffry A.]

> But if only some IP have e reverse..what about the other server who have received an IP in the range? Ip that can be changed every x hours.
> IF no reverse, it can be blacklisted for some reasons or having some problems with services asking a reverse dns resolution.

In my ip6.arpa zone, all of the entries are for servers whose IPv6 addresses never change. If you are going to register PTR records for clients with changeable IPv6 addresses, then you need a dynamic update mechanism. Mark Andrews made a recommendation earlier in this regard. I don't think there is any reason to have PTR records that have no corresponding AAAA records in the forward lookup zone. That would be computationally infeasible anyway. Jeff.