How to update Windows DNS server with Linux DHCP client hostname?

[Patrick Doyle]

On 5/21/07, Patrick Doyle <wpdster at gmail.com> wrote:
> I'm nowhere closer (as far as I can tell), but I've just enabled
> syslog to dump everything and I've noticed that when dhclient starts
> up, after it gets its IP address, it logs the following message:
>
> Unable to add forward map from <hostname> to <A.B.C.D>: timed out
>
> where <hostname> is the name I specified in the dhclient-eth0.conf
> (I've tried just the hostname, and the fully qualified hostname, with
> and with out the trailing period) and <A.B.C.D> is the IP address
> fetched from the DHCP server.
>
> From everything I've read, I believe that I should be able to enable
> this by adding the following lines to /etc/dhclient-eth0.conf:
>
> send fqdn.fqdn "<hostname>";
> send fqdn.encoded off; # or, perhaps "on"
> send fqdn.server-update false;
>
> and I've tried
>
> send fqdn.no-client-update off;
>
continuing on after I must have hit the send key...

The DHCP and DNS servers are both windows servers locked in a closet
someplace.  I would like to figure out what option I need to set on my
FC6 boxes to enable dynamic updating of the DNS records on those
servers.  It works from the windows hosts (managed by our IT
department), but I can't figure out why it doesn't work from my Linux
hosts (managed by me).

I presume that the "unable to add forward map...timed out" message is
the result of dhclient attempting to make the DDNS update.  I have no
idea where that timeout is specified, otherwise I'd try doubling it to
see if that makes a difference.  I have no idea to which port it is
attempting to connect (nor which protocol), otherwise I'd try changing
that.

I have seen references to DDNS updating things securely, but I have no
idea where to plug in an "update" key into dhclient (nor do I even
know what words to use to ask our IT department what update key
they've programmed into all of the myriad windows PC's around the
organization -- I suspect they have not, so I suspect I'm on the wrong
track here).

Any and all clues will be gratefully accepted.

--wpd