DDNS fails. record allready exists

Bill Larson wllarso.dns at gmail.com
Tue Dec 21 22:38:13 UTC 2010

On Mon, Dec 20, 2010 at 1:34 PM, <magic-bind at damage.devloop.de> wrote:

> Hi List,
> I have not yet found a solution for my problem. So I came here:
> I use DDNS. Every night my server (in my local network) is shutting down.
> On
> the next day I have the problem that DDNS is no longer working, because on
> update I get the error that the DNS record allready exists. What is the
> solution?
> I use BIND version 9.7.2_p3-r1.

Well, there have been two questions asked but no more information given.
That doesn't make it easy for anyone to help you.

Some questions:

1. What is your DHCP server?  H/W and S/W.  Are you talking about a Linux
box running "dhcpd" or a NetGear router running their DHCP server.  This may
make just a little difference.

2. Why is your server shutting down?  Is this shutdown expected?  Also,
which server are you referring to?  Is this the DNS server or the DHCP
server (or both)?  You may have problems well outside the issue of DHCP and

3. Who is trying to perform the DDNS updates?  Is this the client machines
or the DHCP server?

4. What do you see in your logs?  This may answer your question without any
more work on anybody's part.

5. What is your DNS server configuration?  Who is allowed to perform DDNS

6. When you say that "the DNS record already exists", have you confirmed
this?  Just query your DNS server for that record and see if it is really
there.  If it is not, this this message, which I am assuming is from your
DHCP server or from your client machine, isn't true.  Then again, if it
really does exist, why would you think that it magically disappears?  If you
add a record to a zone, why would you think that it shouldn't still be

7.  You say you are running "BIND version 9.7.2_p3-r1".  Sorry, I can
understand the 9.7.2-P3 part, but what is the "r1" you are referring to?
(I'll bet you are running Gentoo Linux, but this is just an assumption.)  Is
this built from the BIND sources from ISC or is this some package that you
got from someone else?

Questions 2 and 4 are simply reiterations of questions that others have
already posed to you.  The others are mine.

We would like to help and your assistance is critical.

Bill Larson
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