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Running a OPNsense firewall in a VM? (slrpnk.net)

submitted 7 months ago by [email protected] to c/[email protected]

30 comments fedilink hide all child comments

I am not overly happy with my current firewall setup and looking into alternatives.

I previously was somewhat OK with OPNsense running on a small APU4, but I would like to upgrade from that and OPNsense feels like it is holding me back with it's convoluted web-ui and (for me at least) FreeBSD strangeness.

I tried setting up IPfire, but I can't get it to work reliably on hardware that runs OPNsense fine.

I thought about doing something custom but I don't really trust myself sufficiently to get the firewall stuff right on first try. Also for things like DHCP and port forwarding a nice easy web GUI is convenient.

So one idea came up to run a normal Linux distro on the firewall hardware and set up OPNsense in a VM on it. That way I guess I could keep a barebones OPNsense around for convenience, but be more flexible on how to use the hardware otherwise.

Am I assuming correctly that if I bind the VM to hardware network interfaces for WAN and LAN respectively it should behave and be similarly secure to a bare metal firewall?

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[–] [email protected] 1 points 7 months ago

I followed some guide to put Opnsense on Proxmox. I pass through 2 NICs and set the KVM (using the Proxmox make-a-VM GUI) to be the CPU arch it runs on for that extra speed (but that setting precludes easy transfer to a new box with a different arch). Plenty fast and I run another Linux VM on the same box that does stuff I’d want Opnsense to do (DNS, VPN, etc.).

If I did it again I’d prob do LXD (Incus now), Proxmox has a long startup time and is fiddly to use (to me at least). Looks like Incus can do the same KVM thing, just with less steps and stock Debian.