Connecting multiple computers through one Kerio VPN client?

Question

System administration

The picture shows an approximate picture of the branch network Https://prnt.sc/tcs41n
There are many (hundreds) of branches. They have many computers. Among them there is a main computer (almost a server). a fixed IP address. It allows you to transfer data from the main computer of the branch to the server (other external connections outside the Kerio network do not work). Radmin and system RDP are used to connect to the remote desktops of the main computers. To connect to the desktop of the secondary computer, you need to connect to to the main computer, then through RDP in the main computer go to the secondary computer. At the same time, 2 desktops are involved.

What and how can be done so that you can connect to remote workers of secondary computers, bypassing the desktop of the main computer?

You cannot add licenses to Kerio because there are a lot of computers. Radmin will not connect without an IP.

There is an idea to install a separate radmin or a similar program on the main computer. By connecting to the main computer as usual, you can already manage the computers in the branch without RDP.

P / S This is my first question on this site) Usually I found answers here.

Answer 1

https://habr.com/ru/company/big/blog/330450/

Answer 2

For rather than easier, configure routing through the main computer