bind9/dhcp3 DDNS error

Barry Finkel b19141 at
Mon Mar 12 13:44:38 UTC 2007

jerzy burzek <jerzy.burzek at> wrote:

>Hello, i have small network (25 PC) with windows 2000/XP and debian 
>server with dhcp3 and bind 9
>While trying to implement ddns (dhcp updates dns), there is a problem 
>with updates.
>Clients are able to register in the reverse zone, but there are no
>records in forward zone. In log, these lines are present:
>hts-fw named[2100]: client updating zone 
>'': update unsuccessful: 'RRset exists 
>(value dependent)' prerequisite not satisfied (NXRRSET)
>Mar 11 21:56:53 hts-fw named[2100]: client update 
>'' denied
>Have anyone idea what i'm doing wrong?

Look at RFC 2316, DDNS.  It describes the DDNS process.  From the
messages above, the DDNS packet has a pre-requisite condition that
was not satisfied; therefore the DDNS update was not attempted.
You might have to run a packet trace to see exactly what is the
pre-requisite condition.

I cannot tell if you have a configuration error, as I do not know

     1) what is the pre-req in the packet and
     2) what is currently registered in DNS.

I have no experience with W2k, DDNS, and BIND; our DDNS is from a MS W2k
DNS Server dynamically updating zones on a MS W2k DNS Server.  That
Server is a master for our BIND slaves.
Barry S. Finkel
Computing and Information Systems Division
Argonne National Laboratory          Phone:    +1 (630) 252-7277
9700 South Cass Avenue               Facsimile:+1 (630) 252-4601
Building 222, Room D209              Internet: BSFinkel at
Argonne, IL   60439-4828             IBMMAIL:  I1004994

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