On Mar 26, 2015, at 1:26 AM, Paul Vixie <p...@redbarn.org> wrote: > you make an excellent point. so, the spec might ask for repeatability, > but not specify how that's to be achieved. it's still an information > leak since the preferred type may have timed out of the cache, in which > case an rdns would have to return the next thing on its priority list. > (refetching should NOT be done!)
I don't think you need a priority list--any deterministic mechanism will do. I'd suggest using the numerical RRtype code, and choosing the highest number. This will not always return the smallest RR, but it has the virtue of preferring AAAA to A, but quite possibly sending neither (which I think is even better). _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
