The practical applications of NetFlow capture tools span multiple disciplines:
Despite their power, NetFlow capture tools are not silver bullets. The primary challenge is . On high-speed links (10 Gbps+), many routers sample only 1 out of every N packets to preserve CPU cycles. This sampling can miss short-lived flows ("mice flows") while accurately capturing long, heavy flows ("elephant flows"). Furthermore, NetFlow is stateless; it cannot reconstruct a TCP session or extract files. For that, a dedicated packet capture appliance is still required.
The practical applications of NetFlow capture tools span multiple disciplines:
Despite their power, NetFlow capture tools are not silver bullets. The primary challenge is . On high-speed links (10 Gbps+), many routers sample only 1 out of every N packets to preserve CPU cycles. This sampling can miss short-lived flows ("mice flows") while accurately capturing long, heavy flows ("elephant flows"). Furthermore, NetFlow is stateless; it cannot reconstruct a TCP session or extract files. For that, a dedicated packet capture appliance is still required.