dns port parameter in smb.conf

Dear colleagues,

I would like to clarify the purpose and intended use of the |dns port| 
parameter in |smb.conf|.

In my setup, I changed this parameter on a domain controller to a 
non-standard port (e.g., 5353). When querying this port explicitly, DNS 
resolution works as expected. However, DNS replication between domain 
controllers no longer functions.

Below is a relevant excerpt from the configuration and socket status:

[root@dc ~]# grep 'dns port' /etc/samba/smb.conf dns port = 5353 
[root@dc ~]# netstat -anp | grep 5353 tcp 0 0 192.168.150.10:5353 
0.0.0.0:* LISTEN 2393/samba tcp 0 0 192.168.171.10:5353 0.0.0.0:* LISTEN 
2393/samba tcp 0 0 127.0.0.1:5353 0.0.0.0:* LISTEN 2393/samba tcp 0 0 
::1:5353 :::* LISTEN 2393/samba udp 0 0 192.168.171.10:5353 0.0.0.0:* 
2393/samba udp 0 0 192.168.150.10:5353 0.0.0.0:* 2393/samba udp 0 0 
127.0.0.1:5353 0.0.0.0:* 2393/samba udp 0 0 0.0.0.0:5353 0.0.0.0:* 
771/avahi-daemon: r udp 0 0 ::1:5353 :::* 2393/samba udp 0 0 :::5353 
:::* 771/avahi-daemon: r

 From my understanding, this behavior is expected, as standard DNS 
replication mechanisms assume the use of port 53.

As a possible workaround, I am considering deploying a caching DNS 
server (such as BIND) on the same host, listening on port 53, and 
configuring it to forward DNS requests to Samba on port 5353.

Could you please confirm whether such a configuration is supported and 
would function correctly in terms of DNS replication?

Thank you in advance for your assistance.


-- 
*Anton*
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