negative caching time and TTLs

[Lena M]

Hello,


Which TTL value is supposed to be used for negative caching time?


-We are running BIND 9.X as a caching server. We are seeing that NXDOMAIN replies are being cached using $TTL time of a given zone instead of its SOA min TTL time. 

-Is $TTL suppose to override SOA's min TTL for the negative caching?  RFC 2308 is not clear.

Thank you
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