freebsd: don't use `-f' in hostname
-if a zone doesn't change, don't bump the version
-BIND9: options
-BIND9: `bak' must be owned by the bind user
+- NSCVER macro
+- Update or delete nsc.lsm
-empty zone for 254.169.in-addr.arpa. (RFC 3927)
+DNSSEC:
+- DS records and dependencies on them
+- in reverse zones, file name != zone name => need to pass zone name to genzone
+- dependencies on resign-stamp