authentication for clients connecting to the rrdcache daemon!
If your rrdtool installation was built with libwrap then you can use
-hosts_access to restrict client access to the rrdcache daemon. For more
+hosts_access to restrict client access to the rrdcache daemon (rrdcached). For more
information on how to use hosts_access to restrict access to the rrdcache
daemon you should read the hosts_access(5) man pages.