OpenVPN routing via two servers

Installing and Using OpenWrt Network and Wireless Configuration
1

I have two severs on different machines. Clients connects to the first one to use it's internet connection. But I need that some destination IPs from clients should use the internet connection of the second server.
How can I make it?

2

You need to do Policy Based Routing and you have 3 options:

  1. mwan3 package
  2. pbr package
  3. a set of rules/routes for the source and destination IPs.