Two decades ago, my former manager saved the day after a university hardware firewall went down.

Over the phone, he instructed the guy to download this floppy disk firewall, specify the ports, traffic direction, basic stuff. Boot the computer and voila, the university network was up again giving the teams hours to get things sorted out.

I forgot its name now but many business would run this floppy disk firewall coz it just worked, once booted it would run "forever".