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YAF vs nfdump: catalog facts
YAF	nfdump
Free Free and open source under the GPL-2.0-only license.	Free Free and open source under a BSD license.
Linux, Command line	Linux, Self-hosted, Command line
Processes live traffic and PCAP files Exports flow records in IPFIX format	Supports NetFlow, IPFIX and sFlow Filtering and aggregation of stored flow records
YAF is the data collection component of the CERT NetSA Security Suite; downstream tools process its flow data.	Command-line only, with no built-in graphical interface Needs network devices configured to export flow data
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: GPL-2.0-only	License: BSD
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.