[question] new bind option "max-recursion-depth"

[Evan Hunt]

On Tue, Dec 16, 2014 at 11:13:17AM +0900, Techs_Maru wrote:
> But, "max-recursion-depth",
> However, it tried but it did not become a Servfail.
> Meaning of is is "Indirections" is described in the document, it means
> that when the authority server that does not come directly returns the
> IP address, such as the NS and CNAME?
> Default 7 times the number of times that follow that?

Suppose a zone is served by name servers in another zone:

        example.com. IN NS ns1.example.org.
        example.com. IN NS ns2.example.org.

So named has to look up ns1.example.org to find that name server.
That adds a layer of recursion depth.  Now, if example.org is served
out of yet another zone:

        example.org. IN NS ns1.example.net.
        example.org. IN NS ns2.example.net.

...that adds another layer.  Named will give up after 7 such
indirections.

-- 
Evan Hunt -- each at isc.org
Internet Systems Consortium, Inc.