KVM: VPN host, guest needs VPN and host access to NFS

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I'm running an Ubuntu guest in KVM, which in turn runs on an Ubuntu host. The host network goes through a VPN (OpenVPN), providing tun0. I need the guest network to go through the VPN as well, except I need to be able to access the host over the network to get the filesystem mounted via NFS.

host address is 192.168.10.10
router address is 192.168.10.1
tun0 is 10.8.8.16

I don't care if my guests are NATed or bridged, or even if I have to use a second network interface. Does anyone have a possible way to do this?

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The solution here is to use the default VM settings, and do network NAT. The VM's address will then be in the 192.168.122.0/24 range and the host will be available on 192.168.122.1. As long as the host is connected to the Internet via the VPN, the VM will also be connected via the VPN. While the host is reachable via its local address (192.168.10.10 in this case), the connection must go through the router. In my case, the connection to the router was slow, but the local switch was fast, so using KVM's default 192.168.122.1 host address for NFS transfers was much faster.

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