Can I connect two LAN's, for example main office and branch office LAN's that have no dedicated public IP (only connected to internet through cheap ISPs) through one VPN server that I installed in VPS (like Digital Ocean)?.
How do I do that if it's possible, and what software will I need?
Thanks...
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Absolutely. You can do this using OpenVPN among other VPN or tunneling software. Ideally 1. Ensure That each office is on a different, non-overlapping subnet. 2. Use routers that support acting as openvpn clients (dd-wrt can be flashed onto many Ethernet routers and does this)

davidgo
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Did you consider just hosting the VPN server at your main site and using a Dynamic DNS provider to publish/update the main site's IP address whenever it changes? I do this for my offices and it works very well, and avoids putting stuff "in the cloud."
As an example, I use no-ip.com and their DUC utility

John Call
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