The history of the AD bit in responses and it meaning.

RFC 1035 -> AD=0
RFC 2535 -> AD=0/1 (records gone through validation) 
RCC 3225 (DO introduced)
RFC 3655 -> AD=0/1 (DO=1 required, answer and authority sections all secure)
RFC 3755 (type code roll)
RFC 4035 -> AD=0/1 (DO=1 required, answer and authority sections all secure)
RFC 6840 -> AD=0/1 (DO=1 or AD=1 required, answer and authority sections all
                    secure)

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: [email protected]

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