Access Server: How can I set up a site-to-site virtual private network (Video)

Site-to-site VPN routing explained in detail

Access Server lets you connect a variety of networks and create secure site-to-site connections in addition to quickly and easily managing users, permissions, subnets, and connections with or without Linux knowledge.

Access Server provides secure, reliable connections across all of your distributed networks by giving you the ability to:

• Eliminate single points of failure and ensure high network performance by setting up an “active-active” cluster configuration with multiple Access Servers.
• Easily connect OpenVPN-compatible routers at remote offices to the Access Server at your corporate network with a process much easier than IPSec.
• Deploy Access Server on a cloud network and configure secure gateway clients at remote offices.
• Find Access Server at the most popular marketplaces, including AWS, Azure, Google Cloud, DigitalOcean, and Oracle.

Access Server Resources:
OpenVPN Access Server Documentation
OpenVPN Access Server Resource Center
OpenVPN Access Server Admin Manual