Paul Hoffman wrote:
RFC 1035 and RFC 2181 are unclear about whether an RRset that is
required in a reply can be partial.
1035 is clear:
- When several RRs of the same type are available for a
particular owner name, the resolver should either cache them
all or none at all. When a response is truncated, and a
resolver doesn't know whether it has a complete set, it should
not cache a possibly partial set of RRs.
Masataka Ohta
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