Jan Ingvoldstad writes:
RFC 1035:<domain> ::= <subdomain> | " " <subdomain> ::= <label> | <subdomain> "." <label> <label> ::= <letter> [ [ <ldh-str> ] <let-dig> ] <ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str> <let-dig-hyp> ::= <let-dig> | "-" <let-dig> ::= <letter> | <digit>
Indeed.So any DNS reply that contains one of these fails to validate RFC 1035's grammar, and is ill-formed.
When a reply is ill-formed, no assurances can be made that some parts of it could be interpreted, or salvaged. Discarding the entire reply as a malformed, unprocessable reply, is not unreasonable.
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