Given this soa: fe80.info. 3600 IN SOA ns-538.awsdns-03.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 60 I see bind caching negative answers for 3600 instead of 60. The rfc and my google searches suggest that it should pick the MIN(soa ttl, soa min ttl) for that purpose. What am I missing? Thank you, Slava