All tools above are and open-source. Start with ntopng, then migrate to InfluxDB stack if you need scalability.
sFlow shifts the analytical burden from the network device to the collector, making it ideal for high-throughput environments where device CPU is a scarce resource. free sflow collector
It is resource-intensive. Storing raw packet samples at scale requires significant disk space. All tools above are and open-source
When selecting a free sFlow collector, consider the following factors: consider the following factors: