SERVFAIL when two SOA in the domain

Kevin Darcy kcd at
Thu Aug 29 18:58:25 UTC 2013

When RFC 1035 was written, the strict rules between SHOULD/MUST didn't 
yet exist.

That "should" is to be considered a MUST from the standpoint of modern RFCs.

                     - Kevin

On 8/29/2013 2:31 PM, Steven Carr wrote:
> On 29 August 2013 19:22, Stephane Bortzmeyer <bortzmeyer at> wrote:
>> I'm not sure of what the RFC say about that...
> While RFC 1035 doesn't seem to explicitely say that multiple are
> forbidden, or how to handle the case of multiple records, it does
> state under section 5.2. (Use of master files to define zones):
>      2. Exactly one SOA RR should be present at the top of the zone.
> Steve
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