Maybe you are wrong. or may be I am but:
gethostbyaddr returns the names matching the ip.
reverse name entries is as secure as dns gets. if
the ip has a reverse name, the ip for that name
will match the ip.
the discussion in the Cookbook is about
looking, whether the ipaddress you got when looking up by
, matches the original name. which it
will not, unless you have a reverse entry for the same name.
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