Can anyone please tell me if my topology setup has any mistakes (probably does) as I don't know a whole lot about networking, just a few things. Ok so with Virtualbox I want to connect my physical host to a host-only VM for an OpenVPN connection. Then I want to make a NAT VM and connect that to another host only VM (will reside on that NAT VM), for another OpenVPN connection.. Then I want to make another NAT VM (inside the same NAT VM) and inside that make a meshed topology of OpenVPN instances.. I will be web browsing from any one of the meshed topology instances...

You are better draw simple picture to describe your network topology and where is VPN terminator point.

Sorry I tried to make it as clear as possible but there are actually 3 VPNs one for the physical host, one for the NAT VM, and then I want to make another NAT VM (inside the previous NAT VM) that hosts more VMs in a meshed topology sharing a VPN connection with eachother.. The point of the meshed topology is that if any instance crashes in that topology, then it would not disrupt the VPN service.. As from my understanding a meshed topology is used for fault tolerance.. First off however I don't even know if a meshed topo of VPNs is possible or if even it even makes sense to do if it is... Im thinking the way I was planning to use this setup is wrong actually (I shouldn't be using the web from the meshed topo instances) and that the meshed VPN topo is possible but I need to make separate instances that receive the service and use those, instead of actually using the instances in that topo...

IPSec VPN is point-to-point connection. You can build meshed topology using meshed p-to-p connection.

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Thank you I didn't know that, now I do