Multiple SOA records?

Chris Thompson cet1 at
Wed May 7 16:11:54 UTC 2008

On May 6 2008, Lars Hecking wrote:

> RFC 1935 [corrected later to 1035] says:
>    2. Exactly one SOA RR should be present at the top of the zone.
> Note: "should", not "must".

Note also that RFC 1035 precedes RFC 2119. These are not the MUST and
SHOULD that we use these days.

> What kind of consequences can I expect trying to resolve records in a
> domain that has more than one SOA? The domain that is making problems
> is Querying for its SOAs returns SERVFAIL, but querying
> the domain's name servers directly returns two (different) SOAs. This
> appears to create problems with mail (not sure here - another entity in
> my organisation is experiencing the problem).

As others have commented, there seem to be all sorts of problems with
ns{1,2} For example

;; reply from unexpected source:, expected

Frankly, I don't believe that the responses are coming from a BIND 9.4.x
installation, whatever TXT/CH/version.bind says, without later tampering.

Chris Thompson
Email: cet1 at

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