I'll ask my question first, then give details about where I am coming from:

Is it possible to use host only, then have ubuntu act as a proxy to provide internet access to windows? If so, how?

I am trying to get the right combination of networking for my virtualbox windows client VM (win7). My host is ubuntu 10.10 (maverick).

I believe I understand the basic network options (please correct me if I am incorrect):

NAT - Host can't communicate with guest but guest has access to all host's adapters

Host only - Separate adapter but guest has no net access Bridged - bridge an adapter in the host with the virtual adapter to give the host access to the host adapter

I am trying to give my win guest internet access, but also access the host in a separate network.

Bridged only works when the host is connected to the internet (this is a laptop) so when it's not connected the network is down.

Thanks I appreciate your help.