IPv6 DDNS with dhcp-4.2.1

[sub at nryc.fr]

Le 16/03/2011 18:56, Jonathan Barber a écrit :
> I'm trying (and failing) to get dhcpd to update my DNS server with the
> hostname defined by the name of the host declarations for IPv6
> clients.
>
> I'm using the 4.2.1 release of the ISC DHCP as the DHCP server,
> compiled on Red Hat 5.4 x86_64. My test client is the stock "dhcp6c"
> programs on RHEL5.4 x86_64.
>
> My dhpcd configuration is as follows:
> ddns-update-style  interim;
> option dhcp6.name-servers  fe80:0:0:0:250:56ff:fe99:123;
> option domain-name         bork;
>
> key dhcpupdate {
>    algorithm  hmac-md5;
>    secret     KEOh21UeVROIuQFECY8hNA==;
> }
>
> zone bork. {
>    primary    10.112.29.250;
>    key        dhcpupdate;
> }
>
> host ies-dev-gluster3 {
> 	log(error, concat("IPV6: ", host-decl-name));
> 	fixed-address6 fc00::2;
> 	host-identifier option dhcp6.client-id
> 00:01:00:01:15:12:53:b9:48:5a:8a:2f:e0:2a;
> 	ddns-hostname = host-decl-name;
> }
>
> subnet6 fc00::/7 {
> }
>
> I start the server with:
> dhcpd -6 -cf /etc/dhcpdv6.conf -lf /var/lib/dhcpv6/server6.leases
>
> Running the client I get the new IPv6 address, and it updates the
> nameserver configuration in /etc/resolv.conf - but the dhcpd doesn't
> update the DNS - in fact it looks like the daemon doesn't even try to
> contact the DNS server.
>
> I see the following messages in the log:
> Mar 16 17:17:27 ns0 dhcpd: Solicit message from
> fe80::250:56ff:fe99:138 port 546, transaction ID 0xEB300B00
> Mar 16 17:17:27 ns0 dhcpd: data: host_decl_name: not available
> Mar 16 17:17:27 ns0 dhcpd: data: host_decl_name: not available
> Mar 16 17:17:27 ns0 dhcpd: Sending Advertise to fe80::250:56ff:fe99:138 port 546
> Mar 16 17:17:28 ns0 dhcpd: Request message from
> fe80::250:56ff:fe99:138 port 546, transaction ID 0x7D2D5400
> Mar 16 17:17:28 ns0 dhcpd: data: host_decl_name: not available
> Mar 16 17:17:28 ns0 dhcpd: data: host_decl_name: not available
> Mar 16 17:17:28 ns0 dhcpd: Sending Reply to fe80::250:56ff:fe99:138 port 546
>
> I've tried setting the "ddns-hostname" parameter to a constant value
> and nothing happens. Ditto if I remove the parameter completely.
>
> I've used almost exactly the same configuration of IPv4, and it works,
> so I don't think I'm doing anything stupid.
>
> Should it work? Can anyone see if I'm missing something obvious?

Maybe the "ddns-domainname" statement?

I'm new to DHCP(v6) and DDNS but I think "host" statements are global so 
you have to tell on which DNS zone the DHCP should make the update.

In my case it's on the global configuration section and also in my 
"subnet6" section. You don't use IPv6 ranges so maybe you need to put it 
in you "host" section.

Nicolas