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Proxmox, OPNsense VM with two ethernet ports issue.
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this post was submitted on 28 Aug 2023
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Proxmox lets you do that? Don't. Just give the opnsense VM a virtual NIC and do a router-on-a-stick configuration.
You could also just assign one physical port to the opnsense VM and still do a router-on-a-stick.
Although personally, I wouldn't recommend virtualizing your network gateway. If you break Proxmox, you'll also lose Internet access. And if you have to do maintenance on Proxmox, same issue.
The inverse is my recommendation to virtualize the firewall, easy backups/snapshots, migrate to another host, setup CARP, etc.