Why would a master zone use forwarders ?

[Ben Croswell]

If you load foo.com on server A and delegate bar.foo.com to server B with a
global forwarder of server C you resolution will vary depending on forward
first vs forward only and forwarders {}.

With no forward {} the path for blah.bar.foo.com directed at server A will
be A > C > B
With forward {} the global forward will be short circuited for foo.com and
below resulting in a path of A > B

On May 12, 2017 11:56 AM, "Mik J" <mikydevel at yahoo.fr> wrote:

Thank you Ben for your answer

My server uses a global forwarding

I don't understand what you wrote
"If it is master for a foo.com and also has global forwarding it will use
the global forward for any delegated child domains under foo.com unless
they are also loaded locally."

If my DNS is autoritative, why would I use a forwarding ?

For my sub domains I use delegations
sub.mydomain.com NS ns.sub.mydomain.com
ns.sub.mydomain.com A 1.1.1.1

What's the difference between the global forward for delegated child
domains and the delegation I do ?

Thank you



Le Vendredi 12 mai 2017 15h34, Ben Croswell <ben.croswell at gmail.com> a
écrit :


This would only change behavior if the server has global forwarding.

If it is master for a foo.com and also has global forwarding it will use
the global forward for any delegated child domains under foo.com unless
they are also loaded locally.  The forward{} turns off global forwarding
for that branch of the tree.

On May 12, 2017 9:27 AM, "Mik J via bind-users" <bind-users at lists.isc.org>
wrote:

Hello,

If my DNS is master/slave for a zone, why would I want it to use forwarders.

In other terms why would I want
zone "mydomain.com"
{
        type master;
        file "zones/master/com/mydomain.com ";
        allow-update { acl; };
};

Instead of (forwarders {};)
zone "mydomain.com"
{
        type master;
        file "zones/master/com/mydomain.com ";
        allow-update { acl; };
        forwarders {};
};

Why would I want to forward requests if I'm autoritative for the zone ?

Thank you for those who can hightligh this point.

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