Network monitoring is one of the most fundamental responsibilities of a system administrator or network engineer. When traffic slows down, an application becomes unresponsive, or there's a suspicion of a security vulnerability, one of the first places we look is the network layer. At this point, we have two powerful tools, but with different philosophies: SNMP and NetFlow. The question of which is better is a debate I've heard in the industry for twenty years, and there's still no clear "this is better" answer. In my experience, using these two technologies as complementary rather than interchangeable often provides the most accurate solution.
While searching for the cause of delayed shipment reports in an ERP system at a manufacturing company, I first looked at server resources, then database queries... But the real problem turned out to be on the network side, with slowdowns in communication between different VLANs. In such scenarios, having the right monitoring data is critical for resolving the issue at its root. So, SNMP or NetFlow, where and how should they be used? In this post, I will delve into this dilemma based on my own experiences.
ℹ️ Network Monitoring Practice
Network monitoring not only detects performance issues but is also indispensable for security auditing, capacity planning, and business continuity. For me, it's like a surgeon's patient monitor; it allows me to make correct decisions with real-time data.
