AW: Force retry update ddns entrys

Carsten Strotmann (Men & Mice) carsten.strotmann at
Sat Sep 25 17:52:52 UTC 2010

Hash: SHA1

Hello Tom,

before doing the DDNS update, the DHCP Server checks if the record
already exists and if there is a DHCID TXT record that has been created
by this DHCP Server for this record. If there is no DHCID record, or one
that is not being created by this DHCP Server, the DHCP Server is not
authoritative for the information (the address record) and is not
allowed to change or remove the data.

You need to remove the existing A/AAAA record first (via "nsupdate" or
manually in the zonefile).
If the record does not exist anymore, on the next lease renewal the DHCP
Server will be able to create a new one including a DHCID TXT record
that marks this record as being managed by the DHCP Server.

- -- Carsten Strotmann

- -- 
Carsten Strotmann
Men & Mice Services
Address: Noatun 17, IS-105, Reykjavik, Iceland
Phone:   +354-412-1500
Email:    carsten.strotmann at
 Men & Mice
We bring control and flexibility to network management

Disclaimer :

- ----- Original Message -----
> OK, I did that once, but then I had the Problem, if a PC get's a new
> IP and I added manually his A Record: : "FAILD: Has an address record
> but no DHCID, not mine."
> Any Idea how I can get rid of this?
> Regards
> Tom
> -----Ursprüngliche Nachricht-----
> Von: at
> [ at] Im
> Auftrag von Glenn Satchell
> Gesendet: Donnerstag, 23. September 2010 16:44
> An: Users of ISC DHCP
> Betreff: Re: Force retry update ddns entrys
> On 09/23/10 23:57, Zenz, Thomas wrote:
> > Hi all,
> >
> > After updatting our servers to bind (9.7.1-P2) and dhcp(4.1.0) we
> > had Problems with the primary dns.
> > The Server got stuck for certain domains and did not accept ddns
> > updates.
> >
> > Now some Clients cannot be found via DNS, because they didn't get
> > registered or renewed yet, or the Server logs: "FAILD: Has an
> > address record but no DHCID, not mine."
> >
> > Is there a way to retry all active leases to do a ddns update, or
> > force it even DHCID is not mine?
> >
> > Thanks
> > Tom
> The server will do another ddns update when it renews the lease if it
> finds that there isn't already a dns entry. But no way I know of to
> get the server to do it on demand.
> You could write a simple script to do a series of nsupdate commands
> for all your missing entries, I suppose.
> --
> regards,
> -glenn
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