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For the rest, a great and perfect installation. But once WAN was activated and configured, it went UP and DOWN in circles. A reboot brought it back to working perfectly okay. Then, after some time, it started again. No chance but to reboot. And when going UP and DOWN, CPU usage went up towards 100 %.

I found an old (2019) post
https://forum.opnsense.org/index.php?topic=13385.msg61575#msg61575
describing something very similar. Alas, there was no answer then.

Just unplugging and replugging an old m0n0wall or a modern pfsense into the same WAN link show nothing of that kind.

Therefore, alas, no chance to use OPNsense for the time being.

First, congratulations to a promising new project!
What I read so far looks good, sounds sensible. Good.

I have been running a Soekris 4801 for 10 years now at our house(s) and was happy with the 'fire and forget'. From time to time an upgrade to m0n0wall, of course.

While I totally appreciate your efforts, including the superior PF of the OpenBSD people, I really don't see (maybe Bill Gates beat me to it? Or IBM's Watson in 1944?) that our cable modem needs a firewall with more than 128 MB of RAM, running off a CF larger than 512 MB. ;-)

Having just read Manuel Kaspers death cert on m0n0wall, I'd really love to know about a replacement for embedded stuff. Let's face it, most home users won't have to run a noisy quad-core 64-bit machine for the effective filtering of a cable modem or likewise, even if we have a dozen 'machines'. [The quotes are there because the clients are in many cases mobil phones, tablets, Internet radios, or PCs to write a mail, a twitter, or send a text document.]
In case OPNsense has another target, I wouldn't mind a pointer to another embedded solution, preferably based on BSD and running in RAM.

Kind regards,

Uwe