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InMon made sFlow an open standard (RFC 3176, later 7452), free for any vendor to implement. Unlike Cisco's proprietary NetFlow (which required complex stateful tracking on the router), sFlow was and ran entirely in hardware on the ASIC. This was much cheaper and safer for routers. Chapter 2: The Problem the Analyzer Solves sFlow solved export , but not analysis .
The analyzer keeps an in-memory hash table keyed by (src_ip, dst_ip, src_port, dst_port, protocol) . It adds the extrapolated bytes and packets to that key. sflow analyzer
A modern analyzer (e.g., FastNetMon, Akvorado) uses sFlow to watch for SYN floods. When a DDoS starts, the analyzer detects the anomaly in <1 second, extracts the victim IP from the sFlow samples, and automatically injects a BGP FlowSpec rule to block the attack at the router—all without human intervention. InMon made sFlow an open standard (RFC 3176,
It looks like: [eth1][sampled][TCP][10.0.0.1:54322 -> 8.8.8.8:443][1/1000] Chapter 2: The Problem the Analyzer Solves sFlow