The official YAF project is open-source on GitHub. Look for: Based on the search results, "YAF" primarily refers to , a high-performance network security tool designed by CERT NetSA to convert packet data (PCAP) into bidirectional flow records (IPFIX format). It is widely used by network analysts for monitoring, deep packet inspection (DPI), and traffic analysis. 0;16; sudo yaf --live pcap --in eth0 --out live_flows.yaf |