Cisco Asav Virtualbox For Mac

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Hi,
I want to create a little testing environment, so I got a spare ASA 5505 and allready have my MacBook Pro with Mountain Lion on it. The ASA is correctly configured(I used it at a customer until the new one arrived)
I have VirtualBox installed with various servers and 2 clients, and want to work with separate Vlans to get this testing environment as real as possible(i still have much to learn - right now i focus on OpenLDAP and ASA ACL's)
on the Mac:
The Vlan Tags are working - i get the correct DHCP IP Address on the Mac(on the Vlans where its configured)
ip_forwaring is activated
VirtualBox:
I could select the bridged Vlans for each network interface.
When i start a Virtual Windows Client he gets the correct IP Address and can reach the mac but not the ASA (ipconfig /renew wont work). Also when i start a Virtual Client which is in the ADMIN Vlan and have all rights i can ping the Mac but not the ASA.
Wireshark:
'1642','1424.381718000','CadmusCo_b1:96:ee','Broadcast','ARP','42','Who has 172.28.19.1? Tell 172.28.19.129'
.. tomorrow i can send the image, today it won't work
Any advice how i can get Vlans on VirtualBox working so i can make use of ASA access-list would be nice.
I think there is a problem on the MAC so he wont forward the traffic.
Best Regards,
Peter