Ich habe mittlerweile die Lösung direkt vom Anbieter meines VPN bekommen (Identity Cloaker - sehr zu empfehlen)
"Hello,
To share IDC to PS3 you should use our VPN. If you want to share IDC VPN via Wi-FI then connect your Max OS to your router via Ethernet, but if you want to share you VPN connection via Ethernet (use twisted UTP cable) then you have to connect your Mac OS via Wi-FI .
. So you need to create a VPN connection and share it at "System Preferences->Sharing->Share your connection from". And then use UTP cable or Wifi to interconnect MAC and PS3.
Mac VPN:
Choose Apple menu () > System Preferences, and click Network.
Select your VPN service in the list.
If there is no VPN connection listed, then click "+" over the lock icon, and in the menu "Interface" pick VPN, and VPN type L2TP/IPSec, click "Create".
Add server address "uk8.webnexusone.com" and account name is your Identity Cloaker username, click "Apply".
Go to "Advanced/Options", and check "Send all traffic over VPN connection", click OK/Apply.
Go to "Authentication Settings", enter your Identity Cloaker password and shared key/secret "XXXXX" (case sensitive, all without quotes), without certificates; click OK/Apply.
Click "Connect".
Available VPN IPs: AU1,CA2,CA3,CH1,DE2,FR5,IE2,NL2,SE2,UK4,UK7,UK8,UK9,UK10,UK11,US3,US4,US5,US6"