Re: What determines what zones get passed to DLZ?

> I had a bit of a technical question.  I was wondering what determines
> which zones get passed to the dlz driver.  From simple testing, I have
> seen that any zone with a zone declaration get handled by that
> declaration, as opposed to the dlz driver.  However, does anything else
> just get passed to the dlz driver if it is declared?  Could a zone be
> handled by something else before being handled by dlz?

First it checks to see whether any zone defined with a zone statement
can answer the query, then it tries the cache (if any), then it tries
the DLZ driver.

> I was wondering because when you declare the dlz driver in the
> named.conf, there is no explicit mention of which zone is being handled
> by it, however, only one dlz driver declaration is allowed per DNS view.

No, a DLZ driver can actually contain many zones, and they can appear and
disappear in real time (that's why it's called DLZ -- "dynamically loadable
zones").

Incidentally, in BIND 9.10 (next year), we're changing things so that you
can declare more than one DLZ driver, and you can also have a zone
statement that specifies which DLZ driver the zone will be served from.

-- 
Evan Hunt -- [email protected]
Internet Systems Consortium, Inc.

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