Running 12.1 and working on adding ipv6 public network provided by my ISP. Been using ipfilter since fbsd 4.0. Reading /usr/share/examples/ipfilter I find there are no examples about ipv6. Further more there are no ipfilter ipv6 info at all in the handbook.
The README file gives 2 url's for the home of ipfilter which are now dead.
ipfilter documentation across the board needs to be updated to include ipv6 support.