I did read the licensing issue, it meant that derivitive or modified works were not permitted without the author's prior consent; and because the OpenBSD team tightly coupled IPFilter to their network stack, they had to modify each IPFilter release. The licensing issue meant they couldn't use...
PF the firewall? Because PF was developed by Daniel Hartmeier for OpenBSD. PF derived its syntax from IP Filter, and IP Filter was ported to Solaris, among other operating systems.
FreeBSD Jail first appeared in March 2000 with the release of FreeBSD 4.0. Solaris Zones appeared in January 2005...
To completely disable NAT to have a routing-only firewall, do the following.
Go to the Firewall -> NAT page, and click the Outbound tab.
Select the option "Manual Outbound NAT rule generation (Advanced Outbound NAT (AON))" and click Save.
Remove all automatically generated NAT...