+ auth-nxdomain no; # conform to RFC1035
+<% if classes.include?("named::geodns") or %w{diamond orff senfl ravel}.include?(hostname) -%>
+ listen-on { ! 127.0.0.1; any; };
+ listen-on-v6 { ! ::1; any; };
+<% else -%>
+ listen-on-v6 { any; };
+<% end -%>