Hi Greg,
thank you very much for your explanation.
Let’s supposte AD domain was ‘my domain.it’ and I have 6000 computers of
government institute.
Here my bind configuration:
named.conf
———
include “…. named.conf.options" ;
zone "." IN {
type hint;
file "named.ca";
};
include “…. named.rfc1912.zones";
include “…. named.root.key";
———
named.conf.options
———
logging {
channel named_debug {
syslog local6;
severity debug 1;
print-category yes;
print-severity yes;
print-time yes;
};
category default { named_debug; };
};
options {
auth-nxdomain no; # conform to RFC1035
allow-recursion {127.0.0.1; A.B.C.D; dc1.mydomain.it; dc2.mydomain.it; …..
} ;
allow-query {127.0.0.1; A.B.C.D; dc1.mydomain.it; dc2.mydomain.it;
….. } ;
recursive-clients 3000;
allow-query-cache {127.0.0.1; A.B.C.D; dc1.mydomain.it; dc2.mydomain.it;
….. } ; ;
listen-on port 53 { 127.0.0.1; A.B.C.D; };
directory “….. named";
dump-file “….. cache_dump.db";
statistics-file “….. named_stats.txt";
memstatistics-file “…. named_mem_stats.txt";
recursing-file “… named.recursing";
secroots-file “… named.secroots";
recursion yes;
dnssec-enable no;
dnssec-validation no;
bindkeys-file "….. named.iscdlv.key";
managed-keys-directory "….. dynamic";
pid-file "….. named.pid";
session-keyfile "….. session.key";
———
>Thirdly, I would not forward to AD DNS, unless the AD servers also recurse
and can provide >resolution for delegated names below the AD domain
>that are not hosted on the AD servers themselves.
There is no forward option to AD DNS. Forward is enable from AD DNS to
A.B.C.D. bind9 server.
All clients are using AD DNS infact every query, about name of ‘mydomain.it,’
is resolved from AD DNS.
When client asks an external domain, e.g. www.google.it, AD server forward
query to A.B.C.D. server. (Forward option is set on every domain controller)
Only AD DNS make queries to A.B.C.D server and it’s necessary only to
solve external domains.
A.B.C.D. server never makes queries to AD server. A.B.C.D. is next dns
server which partecipates when it’s necessary to resolve an external domain
I hope to have explained right.
I thought A.B.C.D server made query to root server because into
configuration there is no reference to forward option, because I thought to
set as DNS forward a government dns of my country. What do you think?
I have doubts about recursive and iterative queries options too.
Thanks
Il giorno gio 27 giu 2024 alle ore 13:24 Greg Choules <
gregchoules+bindus...@googlemail.com> ha scritto:
> Hi Renzo.
> Firstly, please can we see your BIND configuration and have the actual AD
> domain name.
>
> Secondly, BIND, or any other recursive DNS server, does not 'forward' to
> the root servers, unless you have configured it explicitly to do so, which
> would be a bad idea and not work anyway. It will recurse (paradoxically,
> perform non-recursive aka iterative queries) to the roots and other
> authoritative servers. It is an important distinction to be aware of.
>
> Thirdly, I would not forward to AD DNS, unless the AD servers also recurse
> and can provide resolution for delegated names below the AD domain that are
> not hosted on the AD servers themselves. Personally I would use a stub or
> static-stub zone in BIND to refer to the AD domain.
>
> In general, decide which DNS is going to do the resolving and make that
> the control point, fetching data from wherever it needs to (e.g. AD DNS) -
> using non-recursive queries - and using that data to construct answers for
> its clients.
>
> I hope that helps.
> Cheers, Greg
>
> On Thu, 27 Jun 2024 at 12:02, Renzo Marengo <buckroger2...@gmail.com>
> wrote:
>
>> I have Active Directory domain ( 'mydomain.it' ) with 8 domain
>> controllers to manage 8000 computers. Every Domain controller acts as dns
>> service and resolve internal domain names while forward queries about
>> external domains to another server, which Bind9 dns server (It's inside my
>> company)
>> I'm checking this Bind9 configuration (Centos server) and I see no
>> forward servers so I think It makes bind9 forward queries directly to root
>> servers. What do you think ?
>> According your opinion this Bind9 server should have to forward requests
>> to one or more dns server by forward option?
>>
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