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I have a simple setup like this:
SERVER ---- INTERNET ---- CLIENT
On SERVER I already have OpenVPN set up with a sertificate for CLIENT. On CLIENT I already have OpenVPN set up to contact the server using its key and this is working fine.
Now I would like to set up another OpenVPN connection between SERVER and CLIENT with different settings (lets say the first is TCP and the other is UDP for example).
In this scenario, can I reuse the certificate/key from the first connection in the configuration of the second?
Is this a good practice? Why/Why not? Any caveats to know about?