Remote machine bridge problem

[cgv]

Hi:
I create a virtual machine on Virtual Server 2005 and install Centos 5.5 with OpenVPN.
I configure OpenVPN for bridging, start the bridge script and start OpenVPN without problem.
Next, I install and configure the OpenVPN client on a Windows Vista and start the client. It connects to the server fine.
If I ping to the OpenVPN server IP there is no problem, but if I ping to a machine in the OpenVPN server network I get no response.
Another strange thing that I get is that if I trace from the client to a machine in the OpenVPN server network I see that the traffic is going out throw the default gateway and not over the VPN connection.

Can anyone could help me in this configuration?

Regards