SiLK, the System for Internet-Level Knowledge, is a collection of
traffic analysis tools developed by the CERT Network Situational
Awareness Team (CERT NetSA) to facilitate security analysis of large
networks. The SiLK tool suite supports the efficient collection,
storage and analysis of network flow data, enabling network security
analysts to rapidly query large historical traffic data sets. SiLK is
ideally suited for analyzing traffic on the backbone or border of a
large, distributed enterprise or mid-sized ISP.
The silk-flowcap package contains flowcap, a daemon to capture NetFlow
v5 or IPFIX flows (Internet Protocol Flow Information eXport), to
store the data temporarily in files on its local disk, and to forward
these files over the network to a machine where rwflowpack processes
the data. flowcap is typically used with an rwsender-rwreceiver pair
to move the files across the network.