I've made a couple changes to the named.foo file: miami.foo.com. IN SOA miami. ( 1129199902 ; Serial 10800 ; Refresh after 3 hours 3600 ; Retry after 1 hour 604800 ; Expire after 1 week 86400 ; ??? 86400 ) ; Minimum TTL of 1 day Anyone have a sample config that uses all of the new config numbers?