Securing Hamachi VPN tunneling?

My son wants play Minecraft with his friend via Hamachi VPN tunneling. (Our side use client).

I want only allow outgoing Minecraft connection to friends server(s), but I want deny all other incoming traffic.

How I can do this with my Avast Antivirus (payed)?

Jukka-Pekka Gröhn

see this

http://forum.avast.com/index.php?topic=99469.0