Servers should drop received DNS response messages. #381
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…e them for processing.
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I just noticed that the UDP and TCP server code will happily propagate any received DNS message for processing by the service stack, even if the received message has the QR header bit set to 1, i.e. it is a reply, not a query.
Middleware and customer service code shouldn't have to check every received message to make sure they are not unexpectedly replies rather than queries, so ignore them in the servers.