ACL which can be checked prior to request parsing and authentication
(first entries with only IP and time, if any) are automatically marked
as preauthentication and checked immediately after connection is
accepted, prior to any resources are allocated. Connection is silently
dropped if preauthentication fails.
nscache6 - new command for IPv6 addresses cache
nsrecord supports IPv6 addresses
dnsauth should work with IPv6 servers and clients
+ caching is now more accurate