cTLD and DNS upgrade

[Stephane Bortzmeyer]

On Mon, Jul 04, 2005 at 09:31:29PM +0200,
 Brad Knowles <brad at stop.mail-abuse.org> wrote 
 a message of 25 lines which said:

> >  They are resolvers.
> 
> 	Joy.  More open recursive caching nameservers.

By the way, I know that it is good practice to separate the
authoritative function from the resolving/caching function (and I
regret that BIND has no --authoritative-only option in its configure
script). 

But I wonder if there is today, with the current BIND, a specific
technical reason to do so (such as a known security issue) or if it is
just good practice to put widely different functions on different
servers, just in case.