VS: A And Cname-record

[Jukka Pakkanen]

Yes but before going to RFC details one should check the basic spelling and syntax first...

-----Alkuperäinen viesti-----
Lähettäjä: bind-users <bind-users-bounces at lists.isc.org> Puolesta Mark Andrews
Lähetetty: 18. kesäkuuta 2020 0:27
Vastaanottaja: Bogdan-Stefan Rotariu <bogdan at rotariu.ro>
Kopio: bind-users at lists.isc.org
Aihe: Re: A And Cname-record



> On 18 Jun 2020, at 07:56, Bogdan-Stefan Rotariu <bogdan at rotariu.ro> wrote:
> 
> Hi,
> 
>> On 18 Jun 2020, at 00:44, Ejaz Ahmed <mejaz at cyberia.net.sa> wrote:
>> 
>> when i am trying to add A and CNAME record together  for the same 
>> subdomain, getting an error as below, you all kind  assistance would 
>> be highly appreciated thanks in  advance
>> 
>> my records are as follows in zone
>> 
>> auotdiscover IN A 1.1.1.1
>> autodiscover IN CNAME autodiscover.acig.com.sa
>> 
>> ======================================================
>> dns_master_load: acig.com.sa.hosts:102: autodiscover.acig.com.sa: 
>> CNAME and other data
>> 
>> zone acig.com.sa/IN: loading from master file acig.com.sa.hosts 
>> failed: CNAME and other data
>> 
>> zone acig.com.sa/IN: not loaded due to errors
> 
> CNAME records cannot coexist with any other records last time I’ve 
> checked. See section 2.4 from RFC1912[1]
> 
> [1] https://tools.ietf.org/html/rfc1912

Well it actually goes back to RFC 1034.  Unfortunately it wasn’t enforced in nameservers at the beginning and is still not enforced by some servers.

3.6.2. Aliases and canonical names

...

The domain system provides such a feature using the canonical name
(CNAME) RR.  A CNAME RR identifies its owner name as an alias, and specifies the corresponding canonical name in the RDATA section of the RR.  If a CNAME RR is present at a node, no other data should be present; this ensures that the data for a canonical name and its aliases cannot be different.  This rule also insures that a cached CNAME can be used without checking with an authoritative server for other RR types.

Mark

> —
> Bogdan-Stefan Rotariu
> 
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Mark Andrews, ISC
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