Configure DHCP to update IPv6 DNS records

[Darren Ankney]

Hi Frank,

Before you expend a lot of effort on ISC DHCP, I just wanted to point
out that it is long EOL.   The replacement is Kea
(https://www.isc.org/kea/) which has it's own mailing list:
https://lists.isc.org/mailman/listinfo/kea-users This ISC DHCP
(dhcp-users) user list is no longer very active.

Thank you,
Darren Ankney

On Fri, Feb 13, 2026 at 5:27 PM <forum.1 at roell.co> wrote:
>
> hello everyone,
>
> i am currently adapting the IPv4 solution described in the samba wiki
> (https://wiki.samba.org/index.php/Configure_DHCP_to_update_DNS_records)
> to IPv6.
>
> the planned solution should support the following:
>
> - dynamic IPv6 addresses from the provider
> - SLAAC
> - EUI-64
> - dynamic updates of the bind9 DNS server (DDNS)
> - debian 12 (bookworm)
> - ISC DHCP 4.4.3
>
> the IPv4 solution works as intended. however, i am still having
> problems transfering the addresses [Global Unicast Addresses (GUA) or
> Unique Local Addresses (ULA)] assigned by slaac to the DNS server.
>
> so far, the host configuration in /etc/dhcp/dhcpd6.conf contains two
> variants:
>
> a) # host deb12-01-opr1c-a {
>    # host-identifier option dhcp6.client-id
>    #   00:04:aa:f9:66:38:6a:99:a8:fb:58:6b:9b:1e:fd:59:8b:6d;
>    # fixed-address6 2001:db8:f2a1:2c:250:56ff:fea9:235;
>    # ddns-hostname "deb12-01.ad.example.org"; }
>
> b) # host deb12-01-opr1c-b {
>    # hardware ethernet 00:50:56:a8:02:34;
>    # fixed-address6 2001:db8:f2a1:2c:250:56ff:fea8:234;
>    # ddns-hostname "deb12-01.ad.example.org"; }
>
> if variant a) is activated (by removeing the comment) the "on commit"
> section is never called. in case b) "on commit" is called, but the
> value of "fixed-address6" is null.
>
> it seems that i can not even register a static IPv6 address in DNS.
>
> how can i proceed? background information is also welcome.
>
> best regards
> frank
>
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