flowd is a small, fast and secure NetFlow collector. It offers the following features: * Understands NetFlow protocol v.1, v.5, v.7 and v.9 (including IPv6 flows) * Supports both IPv4 and IPv6 transport of flows * Secure: flowd is privilege separated to limit the impact of any compromise * Supports filtering and tagging of flows, using a packet filter-like syntax * Stores recorded flow data in a compact binary format which supports run-time choice over which flow fields are stored * Ships with both Perl and Python interfaces for reading and parsing the on-disk record format * Is licensed under a liberal BSD-like license