DDNS

[Mark Damrose]

"Neil Koozer" <neilkoozer at adelphia.net> wrote in message
news:bi5let$i6v$1 at sf1.isc.org...
> Kevin Darcy wrote:
>
> > Neil Koozer wrote:
> >
> >> Mark_Andrews at isc.org wrote in message
news:<bgdr05$24ue$1 at sf1.isc.org>...
> >> > > Any ideas on how to fix these errors in Bind 9.2.2
> >> [...]
> >> > > Aug  1 08:27:47 ns3 named[21372]: client 10.11.32.11#32777:
updating
> >> > > zone dhcp.mydoman.com /IN': update failed: 'name not in use'
> >> > > prerequisite not satisfied (YXDOMAIN)
> >> > > Aug  1 08:27:47 ns3 named[21372]: client 10.11.32.11#32777:
updating
> >> > > zone dhcp.mydoman.com /IN': update failed: 'RRset exists (value
> >> > > dependent)' prerequisite not satisfied (NXRRSET)
> >> > >
> >> > > It doesn't seem to let me update my dhcp zone.  Could this be a
time
> >> > > issue
> >> > > between the 2 servers?  I run a master named server that gets
updated
> >> > > by the
> >> > > secondary named server that also run dhcp.  Any help is
appreciated??
> >> >
> >> >       I see no errors.  The DHCP server asked that the operation only
> >> >       be performed if the pre-conditions were met.  They were not
> >> >       met so the operation was not performed.
> >> >
> >> >       Mark
> >>
> >> Mark
> >>
> >> I see that you're with ISC, so I was wondering if you could possibly
> >> shed a bit more light on this problem.  Presumably there is no error
> >> on the part of named, but there is an error someplace because the
> >> dns+dhcp system does not work.  In my case I have the dns & dhcp
> >> servers on the same machine, and approx 15 clients.  All the clients
> >> successfully get ip addresses from dhcp, and they all get name service
> >> from dns.  I set up the dns part using the book 'DNS & BIND' and I set
> >> up dhcp using the example dhcpd.conf and man dhcpd.conf.  I've tried
> >> it with and without TSIG.  In all of my trials, both dns and dhcp
> >> worked fine, but there has never been a successful update to dns (when
> >> dhcpd issues a new ip number).  Named has never written a journal
> >> file, and I always get the above messages.

Does it work if you use nsupdate?

> >>
> >> In the case of 'name not in use', what name? and not in use by whom?
> >> My domain has a name and all clients have names, and they are in the
> >> zone files as written by h2n.

If you have the Intrim style Dynamic DNS, ISC's DHCP server stores a TXT
record - a hash of the Mac address.  If the A record does exist, but the TXT
record does not, it will not update the zone.

> >>
> >> In the case of 'RRset exists...' it would seem intuative that those
> >> exist since named is working and issuing name service, and it would
> >> seem that dhcpd should not demand the non-existence of the things that
> >> it is supposed to update.

The dhcpd insists that either the name not exist, or that it find the token
that it used to do the update.  It will not update an A record that was put
in the file by some other means.

> >>
> >> Any help would be appreciated; I want to take this thing to work after
> >> it works at home, but a year's searching has been futile so far.
> >
> > Why are you populating your zone files with h2n *and* trying to populate
> > them dynamically with DHCP+DDNS? Seems like you'd either do one or the
> > other, not both. I'm not surprised you're getting conflicts that way...
> >
> >
> > - Kevin
>
> Well... I did it because I RTFM'ed.  I thought of the possiblity that the
> zone files should be empty (in spite of the explicit instructions to
> populate them), so I tested this by removing the records for one host from
> the zone files.  I chose a host that I know gets a new IP address every
> time it boots up in the opposite operating system (Win & Linux).  The only
> net effect is that the records for that host remain absent from the zone
> files.  The dhcp server always trys to do the update, but those messages
> mentioned above still show up in the dns log file.  I would think that the
> 'name not in use' message is now telling the truth.  The only logical
> interpretation of this is that the name must be in the zone file in order
> to be updated, except it doesn't work whether the name is there of not.
>
> Neil.
>