I'm currently running OPNsense virtualised in Proxmox. It's a little confusing if you haven't run a custom firewall before but the setup was relatively simple and works flawlessly now that I understand it a bit better. The only downside being if you are running it on the same machine as your services and need to restart, your network will go down as well. Ideally I will get another machine just for network services as it sounds like you are doing.
this post was submitted on 11 Jun 2023
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Same here, opnsense on proxmox. I'm very happy with it. Snapshots mean I don't have to worry about a "bad" update and I appreciate the easy console access through prox gui without needing an ipkvm or similar in scenarios where I've screwed something up and can't hit the gui or ssh. Plus, if you backup your *sense config after any changes you make, in the event you need to setup a new physical box it's a quick iso install and restore config. For me the pros outweigh the cons, even if a bit of performance is lost.