Hi John,
i've got a system similar (but not identical) to your.
In fact i've got openvpn running on the dom0 and thus serving also the
domU and the rest of the lan (another physical server)
- check that the dom0 has ip_forwarding enabled (sysctl net.ipv4.ip_forward)
- check as well to have a return static route on all the servers you
want to reach trough openvpn
for example on my openvpn server.conf i've got
server 192.168.3.0 255.255.255.0
and my return static route for all the domU is something like
route add -net 192.168.3.0 192.168.100.5
where 192.168.100.5 is the private ip of my dom0/openvpn server
hope it helps
BR
Luca
-- 
http://www.sironi.tk
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