To explain in non tech terms: The NSDC is the NethServer way to implement a Samba4 Active Directory account provider. In the past we had lengthy discussions about this.
The reason for this implementation is that Samba4 natively supports Heimdal Kerberos. Centos/RH supports MIT KErberos natively.
In order to have a limited as possible development for Heimdal kerberos on CentOS, it was decided to use a default Linux container that supports Heimdal Kerberos and is able to run Samba4 natively.
So our Samba4 implementation needed a seperate container with a seperate IP address on the same subnet of one of the green interfaces of your NethServer install.
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