How to determine if a client-side Internet connection is using VPN?

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Network monitoring
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A German Seti@Home user is asking the Boinc developers' forum how one can determine if a TCP/IP connection is a VPN connection or not. Management of his company does not want Boinc using the connection if it is a VPN. Can you tell me how one can tell if a client-side Internet connection is a VPN using, presumably, the Windows API? Thank you in advance for your help.

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You may have to descend to packet examination. View packet contents to determine whether they are encrypted or not. While not all VPNs use encryption, it is a good indicator that a VPN is being used if packets are encrypted.

But this is a four year old question. What answer did you settle upon?

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