* Pavel: > But unfortunately I've found that round-robin balancing don't really > works via unbound. It receives first reply from primary server, puts > it in the cache and then returns it always until the TTL is expired. Reordering the records is supposed to be pointless these days because clients are expected to sort them, basically according to the length of the shared prefix. RFC 3484 has the details. Don't be fooled by the title, the RFC is not (only) about default address selection, and not about IPv6 either, it also deals with how DNS (stub) resolvers report addresses to applications. I think the RFC is fundamentally wrong, but the IETF has not updated it, and the GNU libc folks (among others) treat it as gospel.