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I ran it on Hyper-V for many years. Still running OPNsense that way. It manages 4 VLANS, RDNSBL, a metric ass ton of firewall rules, and several VPN clients and gateways, with just 2GB of ram and 4 virtual procs. It works and doesn’t even breathe hard.
OPNsense all the way. I run it in a VM. I ran PFsense for years then finally went through the pain of migrating. It was worth it for the UI improvements alone. PFsense also corrupted itself twice in about 4-5 years of running it, requiring restores from VM snapshots. OPNsense has been rock solid but it’s only been 2 years since I migrated.
I have used openwrt but only for a WiFi AP, not as a real router. I’ve since moved to a Unifi AP which works fine, but I won’t buy their stuff again for other reasons.