In this paper we will configure Vyatta(Core 6.2) as an OpenVPN server(in routing mode) using for the PKI part XCA instead of easy-rsa.
We will do so per my previous article "Using XCA to configure the OpenVPN PKI part as an alternative to OpenVPN's easy-rsa".
So first make sure you follow the steps from there in order to create a CA and issue certificates for the OpenVPN server and clients.
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