30.4. IPFW - FreeBSD
The ipfw utility is the user interface for controlling the ipfw(4) firewall, the dummynet(4) traffic shaper/packet scheduler, and the in-ker- nel NAT services. A firewall configuration, or ruleset, is made of a list of rules numbe The FreeBSD Diary -- Firewalls / ipfw - protect your subnet see also Firewall rules - some more work. A firewall is a good line of defense against external intruders. It can allow precisely what you want and exclude everything you don't want. I'm using ipfw which [I think] means Internet Packet FireWall. This section will deal mostly with how to configure ipfw. FreeNAS 11.3 + Transmission Jail + OpenVPN + AirVPN + IPFW
Multiple BSD ipfw / ip6fw ECE Bit Filtering Evasion | Tenable®
Nov 18, 2008 IPFW - iptables to ipfw | The FreeBSD Forums Apr 02, 2019 FreeBSD IPFW rules for WireGuard | SirToffski
In security parlance, ipfw is a packet-filtering firewall: it checks each packet coming or going through the Mac’s network interfaces against a set of rules, and allows it to pass or blocks it.
Setting Up ipfw on Mac OS X - Scott's Weblog - The weblog