On 26 Apr 2003 01:42:41 +0200, Thomas Hafner <hafner@sdf-eu.org> wrote:
> 
> One idea was to run named, generate a new named.conf and send SIGHUP
> to named to force rereading of the configuration file. But I find
> named oversized for my single PC and difficult to configure.

http://www.mclink.it/personal/MG2508/nbsdeng/chap-dns.html#SECT-DNSCACHE

Federico's Guide explains setting up a caching name server in 263 words. 
What could be easier?  You just have add the ability to turn recursion on
and off, which looks from here like a little script to mv the right file
into place and send a HUP.  

That sure *seems* simpler than the other options you listed, but maybe I'm
missing something?  

--jkl