forwarding zone setup from a BIND slave (without recursion?)

Thu Apr 8 00:39:12 UTC 2021

Hello Marki, Matus,

Thank you for the insights on this topic.

Answering Marki's question about why the secondary-authoritative (slaves)
are used for lookups is some-what history and there was no need to be
recursive (until now) as all the  queries are authoritatively answered or
refused. May be security is another reason.

Much appreciated your ideas

Thank you
Kind Regards
RK

On Wed, Apr 7, 2021 at 8:01 AM <bind-users-request at lists.isc.org> wrote:

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> Today's Topics:
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>    1. forwarding zone setup from a BIND slave (without recursion?)
>       (RK K)
>    2. Re: forwarding zone setup from a BIND slave (without
>       recursion?) (Matus UHLAR - fantomas)
>    3. Re: forwarding zone setup from a BIND slave (without
>       recursion?) (Marki)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 6 Apr 2021 22:47:23 -0400
> From: RK K <rvkota at gmail.com>
> To: bind-users at lists.isc.org
> Subject: forwarding zone setup from a BIND slave (without recursion?)
> Message-ID:
>         <
> CAOtBJRuBejLxC6-UFf5kGkD_iGnOyTg_ku2PkdXbhPoVYzSuUA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> All,
>
> We have a set of BIND primary servers (MASTERs) and a set of secondary
> servers (slaves to the MASTERs).
> The secondary BIND DNS servers disabled recursion ( with "*recursion no;"
> *)
> in the global options.
> All the applications/systems do use secondary DNS servers for name
> resolution.
>
> Now there is a need to configure a forwarding zone in the "secondary DNS
> servers" to an external DNS server.
>
> In this scenario, in-order for the secondary server to forward the DNS
> query to an external DNS server, is it required to enable the recursion in
> the global options on the secondary servers?
> Based on reference material, I did not see such a requirement. But my
> observation is the query is not getting forwarded ( tried to check using
> the packet trace)
> When recursion is enabled, the query is getting forwarded.
>
> The BIND version I am using is 9.11.2.x.
>
> Appreciate your ideas and help.
>
> Thank you
> Kind Regards,
> Ravi Kota
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> Message: 2
> Date: Wed, 7 Apr 2021 10:35:12 +0200
> From: Matus UHLAR - fantomas <uhlar at fantomas.sk>
> To: bind-users at lists.isc.org
> Subject: Re: forwarding zone setup from a BIND slave (without
>         recursion?)
> Message-ID: <20210407083512.GA19977 at fantomas.sk>
> Content-Type: text/plain; charset=us-ascii; format=flowed
>
> On 06.04.21 22:47, RK K wrote:
> >We have a set of BIND primary servers (MASTERs) and a set of secondary
> >servers (slaves to the MASTERs).
> >The secondary BIND DNS servers disabled recursion ( with "*recursion no;"
> *)
> >in the global options.
> >All the applications/systems do use secondary DNS servers for name
> >resolution.
> >
> >Now there is a need to configure a forwarding zone in the "secondary DNS
> >servers" to an external DNS server.
> >
> >In this scenario, in-order for the secondary server to forward the DNS
> >query to an external DNS server, is it required to enable the recursion in
> >the global options on the secondary servers?
>
> yes.
>
> >Based on reference material, I did not see such a requirement. But my
> >observation is the query is not getting forwarded ( tried to check using
> >the packet trace)
> >When recursion is enabled, the query is getting forwarded.
> >
> >The BIND version I am using is 9.11.2.x.
>
> --
> Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
> Warning: I wish NOT to receive e-mail advertising to this address.
> Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
> It's now safe to throw off your computer.
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 7 Apr 2021 10:59:30 +0200
> From: Marki <bind-users at lists.roth.lu>
> To: bind-users at lists.isc.org
> Subject: Re: forwarding zone setup from a BIND slave (without
>         recursion?)
> Message-ID: <e1ab189a-1c38-8a52-5b12-b3af9e0a1a30 at lists.roth.lu>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> Hello,
>
> On 4/7/2021 10:35 AM, Matus UHLAR - fantomas wrote:
> > On 06.04.21 22:47, RK K wrote:
> >> In this scenario, in-order for the secondary server to forward the DNS
> >> query to an external DNS server, is it required to enable the
> >> recursion in
> >> the global options on the secondary servers?
> >
> > yes.
>
> To elaborate a little bit on that... Indeed that is how it works,
> unfortunately. When you start using forwarders or stubs, recursion needs
> to be enabled because you're no longer looking for your own
> authoritative data only.
>
> What I've learned from this list is that you should split authoritative
> and recursive service.
>
> In other words, you need two types of servers:
>
> 1) A non-recursive one in the backend containing your authoritative
> zones only. This can be a hidden master setup, somewhat like what you
> are using now.
>
> 2) The one your users access has recursion enabled, and contains stubs
> to the authoritative service. Obviously, it can also contain stubs (or
> forwarders) to anywhere else. At the same time it is performing full
> recursive service unless you take authority for the root zone.
>
> May I ask what is the reasoning behind your current setup (pointing your
> users to the non-recursive service)? What would you like to achieve?
> What would you like to prevent?
>
> Bye,
>
> Marki
>
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