this post was submitted on 25 Aug 2024
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This is possible, and exact directions will vary on distribution of the vm client. I personally do this but with split horizon dns and dnsmasq on a vm.
impossible to leak is where it gets tricky, and that will require an understanding of networking in your distribution. there will also be tutorials on this, but it's very easy to mess up.
There are so many options it is almost impossible to know where to start!
Which distro is the VM running (is it even Linux)?
If you want the VM to use the host's VPN then you will need some routing and perhaps NAT/masquerade. This is non trivial to sort out. Can the VM have its own VPN connection to your supplier?
You are starting to reach the point where VLANs/subnets and separate routers (real or VM) may be required. Depending what you use as your ISP router, we might be able to get a solution together - so what model is it and do you have any switches?
This can be handled pretty much entirely on the host by configuring your qemu settings; it's got very robust virtual networking options. Basically just expose the host's VPN interface (e.g. usually called something like
tun
) for VPN access, and make a separate virtual interface that only the host and guest can access for the stuff like ssh.Here's the qemu wiki about networking, definitely where you should start