ttl for negative responses is not following rfc2308

[刘明星：）]

I test BIND 9.7.2-P2 and thus find the ttl for negative responses is not following rfc2308, 
and instead check the $TTL. If the TTL is smaller than 3h, negative ttl is set to the TTL, otherwise to check mimum TTL. If the value is smaller than 3h, negative ttl is set to the ttl, otherwise set to 3h(10800)


2011-08-19 



Mingxing
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