OpenVPN 2.x NIC Binding Questions

I realize this has probably been asked many times but if the outside network 
is eth0 and the inside network is eth1, and one wants retain these networks, 
then is an eth2 physically required for the OpenVPN 2.x virtual network to 
bind to?

I'm a little confused here as there are eth1-network devices (printers, etc) 
that would not function within the virtual network.

So, to accomplish this, should I add another network card for virtual network 
binding?
-- 
Raymond


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