Difference between delegation and forward zone

[Barry Margolin]

In article <mailman.1039.1488821503.74444.bind-users at lists.isc.org>,
 "McDonald, Daniel (Dan)" <Dan.McDonald at austinenergy.com> wrote:

> Yes, you can forward to a subdomain.  Just define it as a separate zone and 
> include the forwarders and forward-only lines.  I believe you need 
> allow-query-cache for this to work.

This won't work reliably if the server is supposed to be authoritative 
for the parent domain. The problem is that queries from resolvers do not 
have the Recursion Desired flag set, and forwarding is only done when 
recursing.

Also, if there are no delegation records for the subdomain, the parent 
server believes it's authoritative for them, despite having forwarders 
configured.

Forwarding is generally only useful on resolvers, not authoritative 
servers.

-- 
Barry Margolin
Arlington, MA