OpenSnitch is a GNU/Linux application firewall.
Installation and configuration
Please, refer to the documentation for detailed information.
If the table family where we're adding a daddr/saddr is inet, we need to specify the protocol of the IP being added. Otherwise, listing the rules they appear as: @nh,128,32 3232235777 accept instead of: daddr 192.168.1.111 accept seen here: #704