That is, given an address, you do an rDNS lookup and get a set of
names ([...]). Do fDNS lookups on those, resulting in a set of
addresses for each one; any which do not include the original
address in their sets should be discarded.
Should following CNAMEs be included here? I can see arguments both
ways.
I would say CNAME following should be done as normal, both de-jure (the
DNS spec says that CNAMEs should be followed whenever the query type is
neither CNAME nor ANY - see RFC 1034 3.6.2) and de-facto (RFC2317-style
delegation for the reverse, and lots of things for the forward).
I'd be interested in what arguments you see for not following CNAMEs.
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