Paul Vixie wrote:
wildcarding should always have been signaled by the server and synthesized in
the stub.
No. See below.
however, when dns was first developed, stubs were tiny and the idea of an extra
500 lines
of C to implement wildcard synthesis would have seemed crazy.
A lot more serious problem is that, before the synthesis, the
stub must check non-existence of exact or more-specific-wildcard
match, which was, w.r.t. server load, prohibitively painful when
negative caching was not available.
That should be why rfc1034 explicitly specify synthesis by the
server.
Masataka Ohta
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