How to configure DNS splitbrain in UCS
You have a public DNS-Domain (let’s call it univention.de) for which you want to configure DNS-records, depending on if you’re inside the corporate network or not.
To illustrate this:
Let’s say, this record is super-secret-ucs-release.univention.de
If you’re inside the corporate network, this dns-record should return the IP-Adress of our new super secret UCS-Release which should be visible only by employees.
If you’re outside the corporate network, it should return the IP of our public landing page.
I assume that the public dns-record is already configured to return the desired public IP address.
For this to work in UCS, you need to create a forward-zone for your full dns-record and set the correct IP in it.
Open “Domain” → “DNS”
After that, click on “Create” , leave “DNS: Foread Lookup Zone” selected and click on “NEXT”
Now enter the full dns-record, the dns-server which is responsible for it and head over to “IP addresses”:
Here you set the ip-address you want to return and, after that, hit “CREATE DNS OBJECT”