
The Access Server also supports sending additional instructions for DNS Resolution Zones, which functions like a type of split-DNS where only queries for a specific DNS zone are sent to the VPN server, and DNS Default Suffix, which provides a hint to Windows to 'autocomplete' a partial hostname to a Fully Qualified Domain Name, or FQDN.

This can be configured in the Admin UI under VPN Settings. Actually it supports pushing 2 DNS servers, in case the first one fails to respond. OpenVPN Access Server supports pushing an instruction to a connecting OpenVPN client to use a specific DNS server. It is for example easier to tell a user to start their Remote Desktop client program and to connect to server1 instead of having to tell them to connect to 192.168.70.243. Companies often run their own DNS server that they use to resolve DNS names to private IP addresses, to make accessing systems easier for users.
