Private IP address in A record

Reindl Harald h.reindl at
Fri Jun 27 09:31:01 UTC 2014

Am 27.06.2014 06:11, schrieb Teerapatr Kittiratanachai:
> I know that this kind of implementation isn't be recommended, but I
> don't understand that why some DNS servers can answer the record as
> normally while another can't.

if there is a cisco-router with NAT between anything
can happen of it faces priate IP's in DNS responses

google for "Cisco NAT DNS ALG"

> On Fri, Jun 27, 2014 at 10:42 AM, Noel Butler <noel.butler at> wrote:
>> On 27/06/2014 12:32, Teerapatr Kittiratanachai wrote:
>>> Dear List,
>>> Yesterday I try to map a private IP address on Public DNS Server, but
>>> some server, actually 1 server, doesn't show the answer. But the Rcode
>>> is 0.
>>> So I already removed that record for now. Is it possible to set DNS
>>> server for not show answer that be the private IP address?

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