On Apr 27, 2010, at 6:46 PM, John Levine wrote:
Hmm. A macro expansion for a /48 would mean 1,208,925,819,614,629,174,706,176 leaves. An interesting stress test for name servers... :-). My inclination would be to use a wildcard that returns something like not-in-service.some-network.net, and let the clients add records for the addresses they use.
While better than 1 septillion zone entries, you still have the problem of how to let the clients add the records. DDNS is one approach. Manual intervention (e.g., as part of a customer provisioning system) is another as long as you don't use privacy extensions.
For spoof resistance, how about doing a forward lookup on the purported name and only installing it if it gets a matching AAAA record?
Sounds like a reasonable DDNS filtering approach. Regards, -drc