1999 or 2000 I think. Checkpoint was the big dog in firewalls and they were ludicrously expensive. I had been noodling around with OpenBSD and realized that you

1999 or 2000 I think. Checkpoint was the big dog in firewalls and they were ludicrously expensive. I had been noodling around with OpenBSD and realized that you could make the image small enough to boot from floppy and run its firewall in a ramdisk (IIRC ipf- this predates the replacement with pf). So we replaced a commercial firewall with ipf running entirely in memory from an immutable floppy disk and it just blew Checkpoint out of the water.