Two network interfaces Prevent DNS entry for one

UCS - Univention Corporate Server
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#1

Hello,

I have a UCS server with two network interfaces. One to the local network and one to the internet.

Both IP addresses are always copied into the DNS entries. If I delete them in the DNS menu or in the Devices menu. After a few minutes both IP addresses are back in the DNS settings.

The clients then always try to connect via the Internet IP, through the DNS entries. Of course, this is intercepted by the firewall and no connection is established.

How can I prevent that the IP address of the Internet interface is taken over again in my DNS settings?

Greetings
Christian

#2

You really cannot. Samba, for example, will always make sure that all IP addresses assigned to interfaces Samba listens on are assigned to the server’s host name & various other DNS records dealing with domain management.

Instead simply fix your firewall to allow access from internal clients, too.

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