Always on VPN RRAS Windows Server 2019 DNS Server list is not updated to the VPN client (orphaned IPv4s)

Question

Hello everyone,

I hope to find support for a problem here ...

Environment:

Windows Server 2019 Standard Version 1809 Build 17763.5696 with Routing and Remote Access Service (RRAS) role

Always On VPN DMZ Deployment with 2x NICs and IPv4 Address Assignment using "Static address pool" and defined to obtain "DNS Server addressses" for VPN clients to private network adapter.

Windows 10 Enterprise Version 22H2 Build 19045.4291 Clients

Problem:

On the RRAS server, the IPv4 assignment is set as followsUser's image

As far as is understood, this setting is used to distribute the DNS server list to VPN clients and order defined on the RRAS server primarily to the VPN clients that successfully log on to the system.

The RRAS server was initially installed with the example "Network card DNS server settings" configuration here:

DNS Server IPv4 A

DNS Server IPv4 B

A successfully connected VPN client then receives this information and uses it for DNS registration of the end device (A/PTR record).

The network card configuration of the RRAS server on the "private NIC" has been adapted, e.g.

the IP address of the DNS server in position 1 is now a different one or the order is adjusted

If the VPN clients reconnect, do these DNS settings remain on the end device!?

The NICs were checked on the server using ncpa.cpl / netsh / Powershell and the orphaned DNS IPv4 address / configuration was searched for in the registry, but nothing was found and the server was restarted several times.

The configuration remains :-(

Where does the RRAS server store this information?

Or how can this be fixed?

Many thanks in advance for any support