Sflow Analyzer May 2026

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.

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. sflow analyzer

The analyzer sees: "1 packet for 192.168.1.100 -> 203.0.113.50, sample rate 1/1000". It immediately multiplies: This represents 1,000 real packets . It then multiplies by average packet size (from the header, say 500 bytes) to get 500,000 bytes (4 Mbits) of traffic contributed by that flow. The analyzer keeps an in-memory hash table keyed