When multiple ISPs called us the same week about unexplained upstream congestion, we expected a peering issue. Instead, NetSense Flow revealed thousands of compromised subscriber devices launching coordinated outbound UDP floods toward Chinese ASNs. This is the story of how we diagnosed it — and why most ISP playbooks fail when the DDoS is coming from inside the network.
When a subscriber loses internet, the root cause is often an ONU going offline—but diagnosing why can take time if operators rely only on OLT CLI and scattered tools. In this guide, we walk through practical techniques for troubleshooting ONU outages in GPON networks, including how to identify power loss, optical faults, partial PON failures, and signal degradation using historical telemetry and network observability. Learn how ISPs can reduce troubleshooting time and quickly pinpoint whether the issue is a single customer, failing fiber, or a larger access network problem.
Twenty years of building ISPs teaches you what diagrams, certifications, and dashboards don’t. These are hard-earned lessons on monitoring, redundancy, automation, and customer experience — learned during real outages, under real pressure.
NetSense Network Map - a modern, fast, clean, real-time replacement for Weathermap, designed for ISPs, IXPs, and Telcos who need a topology view they can actually trust day in and day out.
Traditional ping monitoring leaves blind spots and can even cause false alerts. NetSense NMS now introduces a continuous, lightweight ping engine—delivering real-time insight, detailed metrics, and scalable performance built right in.
Partial PON Port Down detection is now available in NetSense NMS. This new feature alerts you when multiple ONUs on a PON port go offline due to fiber issues—while the port itself is still reported as up. By distinguishing between customer-side power losses and real network-side problems, operators can act faster, improve troubleshooting, and deliver a better customer experience.
We redesigned the NetSense Live Dashboard with a bold move: split OLTs and Switches into their own views and stripped away the noise. The result? A faster, clearer way to spot what matters — without digging.
Thinking about building your own network monitoring system? It might seem like the perfect solution—until it starts owning you. Here’s why buying often beats building when it comes to keeping your network healthy and your team focused.
NetSense NMS now includes Syslog integration, bringing centralized log management directly into your network monitoring workflow. Correlate network events with system logs for faster troubleshooting and complete visibility. Features include advanced search capabilities, visual message analysis, and real-time log streaming - all from a unified interface.
Self-hosting NMS boxes ties up CapEx and staff time just when PON and FTTx traffic is exploding. Netsense NMS flips the model: a private, operator-grade SaaS cloud that auto-discovers OLTs/ONTs, scales on demand and slashes MTTR. Your NOC focuses on customers, not servers.
Frequent fiber outages can cost thousands per minute. Discover seven proven tactics-from AI-driven predictive maintenance to PON-level redundancy and automated TR-069 remediation-that keep FTTH networks online and customers happy.
Open-source NMS tools like Observium shine for servers and routers—but they stumble on PON and OLT monitoring. Learn why ISPs need a single, purpose-built dashboard.
