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MikroTik OpenVPN is able to create a secure and encrypted OpenVPN tunnel between a remote client and OpenVPN Server across public network. So, a remote OpenVPN client can communicate to OpenVP Server's local network as if it was directly connected to the local network. OpenVPN setup guide is available in this article.
For more details: https://systemzone.net/mikrotik-openv... or http://systemzone.net/mikrotik-openvp...