[Pdns-users] PDNS Authoritative and CNAME pointing to external Domain responds with NXDOMAIN

[Thomas]

Thanks for the clarification, but this scares me. How can I have 
configured the server in a way it thinks it is authoritative for the 
entire Internet?
It should be authoritative for zur-sonne.it and the other 2500 domains 
we have, sihosting.cloud is not part of the domains we host....

Am 22.06.2021 um 17:05 schrieb Brian Candler:
On 22/06/2021 15:54, Thomas wrote:
> Doing a "dig www.zur-sonne.it +nostats +nocomments +nocmd @localhost" 
> I (think) get correct result:
>
>
> ; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.5 <<>> www.zur-sonne.it 
> +nostats +nocomments +nocmd @localhost
> ;; global options: +cmd
> ;www.zur-sonne.it.              IN      A
> www.zur-sonne.it. 10800 IN      CNAME cms-v2.sihosting.cloud.
>
> And nslookup can not resolve cms-v2.sihosting.cloud as I pointed it to 
> localhost to query from. Correct?

I believe you're right.  nslookup thinks it's talking to a recursive 
nameserver, and wants to chase the CNAME record. However I would not 
have expected an NXDOMAIN response here; your nameserver ought to have 
returned REFUSED.  It seems like you've made your nameserver 
authoritative for the entire DNS (or at least, for sihosting.cloud)

For that dig command line, when talking to an authoritative nameserver, 
I'd also recommend you add the "+norec" flag, which makes it explicit 
that you don't want to recurse.

Am 22.06.2021 um 16:54 schrieb Thomas via Pdns-users:
>
> Am 22.06.2021 um 16:16 schrieb Brian Candler:
>> On 22/06/2021 14:55, Thomas via Pdns-users wrote:
>>> I have upgraded pdns authoritative server from version 4.3 to 
>>> version 4.4.1 on CentOS 7, MySQL is the backend.
>>> If I query a CNAME record on both servers I get the following error 
>>> (do not remember if it worked before the upgrade):
>>>
>>> [root at pdns1 log]# nslookup www.example.it localhost
>>> Server:         localhost
>>> Address:        ::1#53
>>>
>>> www.example.it        canonical name = cms-v2.externaldomain.cloud.
>>> ** server can't find cms-v2.externaldomain.cloud: NXDOMAIN 
>>
>> Firstly, please don't hide domains: see
>>
>> https://blog.powerdns.com/2016/01/18/open-source-support-out-in-the-open/ 
>>
>>
>> Secondly, which of those domains is your server authoritative for?
>>
>> PowerDNS will not attempt to follow CNAME records.  General recursion 
>> was removed in Authoritative Server 4.1.  (It will send queries for 
>> ALIAS records, but only if you've configured it with a recursor to use).
>>
>>
> Sorry, was not aware of that. So let me try again....
>
> Doing a "dig www.zur-sonne.it +nostats +nocomments +nocmd @localhost" 
> I (think) get correct result:
>
>
> ; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.5 <<>> www.zur-sonne.it 
> +nostats +nocomments +nocmd @localhost
> ;; global options: +cmd
> ;www.zur-sonne.it.              IN      A
> www.zur-sonne.it.       10800   IN      CNAME cms-v2.sihosting.cloud.
>
> And nslookup can not resolve cms-v2.sihosting.cloud as I pointed it to 
> localhost to query from. Correct?
> Where is the stick I could hit myself? Feeling stupid....Should not do 
> this with more than 30° Celsius temperature.
>
> Thanks and sorry for the noise,
> Thomas
> _______________________________________________
> Pdns-users mailing list
> Pdns-users at mailman.powerdns.com
> https://mailman.powerdns.com/mailman/listinfo/pdns-users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.powerdns.com/pipermail/pdns-users/attachments/20210622/c898daaf/attachment-0001.htm>