Netflow Tools __hot__ May 2026

set forwarding-options sampling input rate 1000 set forwarding-options sampling family inet output cflowd 192.168.1.100 port 2055 version 5 :

This guide covers production-grade NetFlow tooling. Start with nfdump for small environments, pmacct + ClickHouse for mid-scale, and GoFlow2 + Kafka for carrier-grade. netflow tools

# Flows per second (FPS) spike nfcapd -p 2055 -w -l /data -T all # Real-time: watch -n 1 'nfdump -R /data -r current -s flows | head' (requires NetFlow v9 + BGP table) It is flow-level accounting

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: 30-day retention, detect botnet C2, per-department billing. It is flow-level accounting .

1. Core Concept: What NetFlow Actually Is NetFlow is a network protocol developed by Cisco for collecting IP traffic information and monitoring network metadata. It is not packet capture (full payload) nor simple SNMP counters (bytes/sec). It is flow-level accounting .