Remember that this instance of named is learning answers which are
also counting down the TTL as they come from the forwarder.  The
prefetch triggers a prefetch in the forwarder assuming it supports
it but the learnt ttl is the same value the record that triggered
the prefetch.

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org