I'm having some issues with setting up firewall on Mac OS X El Capitan version 10.11.4.
I have number of network interfaces including en3, which is my main ethernet connection and and gif0 which is tunnel to ipv6 tunnel broker.
I need to block all outgoing connections on en3 to some network, let it be for example
220.127.116.11/17. It is pretty easy thing to do on linux, but on OSX I can't find a solution.