A Berkeley Packet Filter (BPF) is a filter that you can use in a packet capture tool to retrieve only the subset of network packets that you are interested in.
Beeks applies BPFs in tools such as a Stack Probes. BPFs are most commonly used to listen for a specific IP address, IP network or multicast group, but many more complicated options are available. If you don’t apply a BPF, you’ll have to search through a high volume of data to find the information you want to check.