virtualbox.org

Greetings!
Running XP Pro as host, Ubuntu 9 as guest.
Also have guest with Win 7 RC.

Several local boxes and standard router. Local boxes all running XP (Home, Pro)
With standard install, Guest could see Internet fine, couldn't browse local network.

First guest ethernet adapter was NAT. Added bridged adapter, now can browse local network fine.

Will do more testing. For now, looks good. Will discuss Win 7 on seperate post.
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Belarc's report of the host:
3Com 3C920 Integrated Fast Ethernet Controller (3C905C-TX Compatible) - Virtual Machine Network Services Driver
3Com Gigabit NIC (3C2000) - Virtual Machine Network Services Driver
Intel(R) PRO/1000 MT Network Connection
Auto IP Address: 192.168.0.2 / 24
Gateway: 192.168.0.100
Dhcp Server: 192.168.0.100
Physical Address: 00:0D:56:9D:0E:02
Intel(R) PRO/1000 MT Network Connection - Virtual Machine Network Services Driver
VirtualBox Host-Only Ethernet Adapter
primary IP Address: 192.168.56.1 / 24
Physical Address: 08:00:27:00:54:EC
VirtualBox Host-Only Ethernet Adapter - Virtual Machine Network Services Driver
VMware Virtual Ethernet Adapter for VMnet1
IP Address: 192.168.96.1 / 24
Physical Address: 00:50:56:C0:00:01
VMware Virtual Ethernet Adapter for VMnet8
IP Address: 192.168.149.1 / 24
Physical Address: 00:50:56:C0:00:08

Networking Dns Server: 192.168.0.100