Minimize impact of NXDOMAIN requests

[Neil W Rickert]

Joe Shen <joe_hznm at yahoo.com.sg> writes:

>In fact, we are using BIND9.2.5, BIND9.3.1 as cache
>server, which provide public service. I noticed that
>the NXDOMAIN keep increasing. The amount of NXDOMAIN
>forms a large part of cache server load. Is there any
>method to minimize impact of such requests on BIND?

>********************
>I run "rndc stats" continuously( interval is less than
>2 seconds), it's shown:

>====================
>success 17950622
>referral 225680
>nxrrset 1691861
>nxdomain 11203490
>recursion 3648017
>failure 1363923

I checked on a system that only allows lookups from within
our network.  I find a similar result, in that "nxdomain"
are not far behind "success".