Allow VPN connection from a specific computer

Hy!

I have a MikroTik router which has a L2TP/IPsec VPN Server configured. I would like to control to connect from only a specific computer with L2TP/IPsec VPN. Is there any suggestion to resolve it? So in other words, there is a computer somewhere in the internet behind a NAT device like router. And I would like to control on my MikroTik router.

Thank You!

Any idea?

Control it with a username and password..? I don’t think I understand your question.