I suppose it should be a link to some resource about Berkeley Packet Filters (https://en.m.wikipedia.org/wiki/Berkeley_Packet_Filter https://en.m.wikipedia.org/

I suppose it should be a link to some resource about Berkeley Packet Filters (https://en.m.wikipedia.org/wiki/Berkeley_Packet_Filter https://en.m.wikipedia.org/wiki/Berkeley_Packet_Filter).