samba - Dec 2023 - Samba as Active Directory - Linux Client doesn't update DNS

On Tue, 19 Dec 2023 06:58:49 +0000
Tilo Lutz via samba <samba at lists.samba.org> wrote:
> Hi
> I'm playing with smaba the first time so please be patient with me.
> I want to setup a small active directory on by Raspberry Pi 4 at home.
> Actual my setup is:
> -- Router (DHCP, Forward DNS)
> \- Raspberry with Samba AD and Bind9 as DNS
> Windows and Linux Clients:
> DHCP from Router. The router is configured to annouce the Raspberry
> as DNS server. I configure it as described at:
>
https://wiki.samba.org/index.php/Setting_up_Samba_as_an_Active_Directory_Domain_Controller
> Standard behavior of the router is to put all DCHP clients into it's
> own domain with hostname.router. This is working fine. The samba AD
> also provides DNS service for the domain .ad DNS updates, Kerberos
> etc. is working fine. When a windows client joins the domain,
> hostname.ad is added to bind. The router will add it with
> hostname.router. Tha't exactly what I want. The host is reachable
> with hostname.router and hostname.ad. Unfortunately, this is not
> working for a linux client. I used the realmd to join the active
> directory. It can access the domain, get users and groups but no dns
> entry is added to the bind9 server. I was able to add the client
> manually with samba-tool dns add. To me it looks like the linux
> client never tried to register its dns entry. So my question is: Do I
> expect something from the linux client that is not done by default?
> How can I make the linux client to generate/update their DNS records,
> including IPv4 and IPv6? Thank you very much, Tilo 
> 
A Samba Unix domain member doesn't have the code to update its own dns
records.

There is a workaround, turn off the dhcp server on the router and read
this:

https://wiki.samba.org/index.php/Configure_DHCP_to_update_DNS_records

Rowland

Or - unless they are "roaming clients" - use static ips for linux
domain members...
Joachim

Tilo Lutz via samba <samba at lists.samba.org>
wrote:
> [...] I was able to add the client
> manually with samba-tool dns add. To me it looks like the linux
> client never tried to register its dns entry. So my question is: Do I
> expect something from the linux client that is not done by default?
> How can I make the linux client to generate/update their DNS records,
> including IPv4 and IPv6? Thank you very much, Tilo
On 19.12.2023 08:42, Rowland Penny wrote via samba:
> A Samba Unix domain member doesn't have the code to update its own dns
> records.
>
> There is a workaround, turn off the dhcp server on the router and read
> this:
>
> https://wiki.samba.org/index.php/Configure_DHCP_to_update_DNS_records
On 19.12.2023 10:19, Joachim Lindenberg wrote via samba:
> Or - unless they are "roaming clients" - use static ips for linux
> domain members...
Thank you both for your response. I was unsure if it's normal that unix 
clients won't update the DNS.
My router is providing DHCP but the IP address of the linux client is 
set to static.
therefore, I will just use static IP addresses.
I want to keep the DHCP on my router because it's easier to manage for me

While inspecting the DNS I saw that the samba active directory domain 
controller updates it's AAAA records on restart. It has 2 addresses, one 
local starting with fd00: and one from my internet uplink starting with 
2001:.
The later one will change we the upink is reestablished.
Will samba recognize this and update the record itself?

Thank you very much,

Tilo