Reverse DNS zone generation

Zentyal creates reverse DNS zones for each IP defined on the forward zone Example:

zone for 192.168.6.0/24 -> OK
zone for 192.168.2.0/24 -> NOT OK
zone for 89.109.64.0/24 -> NOT OK

Since I think this is not right I created issue for enhancement:

https://github.com/zentyal/zentyal/issues/1959

Workaround

Created a reverse zone file: /etc/bind/6.168.192.zone

-rw-r--r-- 1 root bind 463 Apr 12 12:56 /etc/bind/6.168.192.zone

with the following contents

#CA20200412 - created this reverse zone manually to overcome the issue where Zentyal generates either all reverse zones or no reverse zones at all
zone "6.168.192.in-addr.arpa" {
    type master;
    file "/var/lib/bind/db.6.168.192";
    update-policy {
        // The only allowed dynamic updates are PTR records
        grant arditi.pt. subdomain 6.168.192.in-addr.arpa. PTR TXT;
        // Grant from localhost
        grant local-ddns zonesub any;
    };
};

Changed the generate_reverse_zones configuration key from yes to no in /etc/zentyal/dns.conf

Added a new stub

sudo cp /usr/share/zentyal/stubs/dns/named.conf.mas /etc/zentyal/stubs/dns/

Edited the stub to include the folloing line:

include "/etc/bind/6.168.192.zone";