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Passing through a NIC just adds complexity, not lessens it. And is a bad idea for a plethora or reasons
I would strongly disagree. In terms of setting up OPNSense (I use pfSense, but same concept), it's easier to just do a PCI passthrough. The alternative is to create a virtual network adapter on your hypervisor, bridge it to a physical NIC, and bind the virtual adapter to the VM. The only advantage to be gained from that is being able to switch between physical NICs without reconfiguring the OPNSense installation. For someone with a homelab, when would you ever need to do that?
My Proxmox server uses a 10Gb PCIe adapter for its primary network interface. The onboard NICs are all passed through to pfSense; I've never had any need to change that, and it's been that way for years.
I don't mean this to sound overly critical, and I'm happy to be proven wrong. I just don't see a "plethora of reasons" why doing PCI passthrough on a NIC is a bad idea.
I'm happy to discuss it, as I've written articles about it.
I live high level routing and firewalling in VMs (60 Gbps+), and there are a couple of realities you need to accept, especially when you involved a *BSD in the mix.
I mean, you do you. But I'd much rather to just be able to change the uplink on a vSwitch or bridge to get my router going again instead of having to reboot, passthrough, insert grub cli options, swap cards, etc.
Having tried both, I found it far easier and less troublesome to just add a PCI passthrough than it is to worry about managing the network both on the host and in the VM. As long as FreeBSD supports the driver, I strongly recommend passthrough vs virtualized NICs.