How to make access to subdomains of the site located on different web servers in the local network?

Question

Domain Name System

The organization’s network has a web server with ISPConfig installed, the registrar has the IP of the server with ISPConfig as the NS server, the DNS zone is configured, and A-records are registered for different subdomains of the site that are physically located on this server. Recently, it has become necessary to spread sites on subdomains to different physical or virtual machines. Suppose that the site subdomain1.site.ru is physically located on the machine with the address 192.168.xxx.5, and the site subdomain2.site.ru is located on the machine with the address 192.168.xxx.6. The servers are located behind Kerio Control, all necessary ports are forwarded to the web server.

Answer 1

You need to raise the proxy and scatter requests to different servers depending on the requested hostname.

Answer 2

so add 1 more A record to the subdomain