ddns-hostname problems - DDNS updates not sent

[Steven Carr]

You might want to send bugs to dhcp-bugs at isc.org

(I so wish the ISC would publicise their bug tracking, equally git/hg
source code repos would be good).


On 5 July 2013 17:46, Daniel Pocock <daniel at pocock.com.au> wrote:
> Package: isc-dhcp-server
> Version: 4.2.2.dfsg.1-5+deb70u6
> Severity: important
>
> I've found that DDNS updates are only sent if ddns-hostname is
> statically defined, e.g.
>
> ddns-hostname "some-name";
>
> Of course, this is not useful because dhcpd will then use the value
> "some-name" as the hostname of every host and the real hostnames won't
> be in DNS at all.
>
> On the client side, I've tried many different permutations, for example,
> the Debian default is to send
>
> send host-name = gethostname();
>
> but I've also tried commenting that out and using:
>
> send fqdn.fqdn "hostname.example.org."
> send fqdn.encoded on;
> send fqdn.server-update off;
> also request fqdn, dhcp6.fqdn;
>
> but it doesn't make any difference.
>
> On the server side, I tried various permutations as well:
>
> - not setting ddns-hostname at all
>
> ddns-hostname = pick (option fqdn.hostname, option host-name);
>
> and various other things I've seen in examples, such as
>
> option host-name = config-option server.ddns-hostname;
>
> option server.ddns-domainname = config-option host-name;
>
>
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