Comment by Lammy

> I was missing something like a template with the defaults that come with UFW, for instance.

FreeBSD does include this! It's implemented using IPFW instead of PF. Check out `firewall_type` key in `rc.conf`: https://cgit.freebsd.org/src/tree/libexec/rc/rc.conf?id=8e08...

For a very easy single-machine firewall, one could set `firewall_type=client` or `firewall_type=workstation` if you want to host anything. For the latter, `firewall_myservices` and `firewall_allowservices` control what ports are enabled and who (other networks/IPs) have access to them.

For a very simple NAT gateway, one could set `firewall_type=simple` and then `firewall_simple_(iif|inet|oif|onet)(_ipv6)?` to configure the ISP-side and internal-side interface names and IPv4 and IPv6 network ranges for each.

For more details and to see exactly what each option actually does, check out `/etc/rc.firewall` where this is all implemented: https://cgit.freebsd.org/src/tree/libexec/rc/rc.firewall?id=...