A Guide to Building Real-Time Kernel-Level Monitoring of Network Policy Violation Traffic with eBPF
Going beyond the limits of L3/L4 monitoring, this guide shows how to use eBPF to track network policy-violating traffic directly at the kernel level. Follow a concrete implementation roadmap that integrates Prometheus and Grafana to gain se
When a Kubernetes L7 Network Policy Doesn't Apply: An eBPF (Cilium) Debugging Workflow
When HTTP header-based L7 network policies fail in Kubernetes, simply re-applying them will not fix the problem. This guide analyzes eBPF vs. iptables, diagnoses three policy-failure pitfalls, and presents a practical debugging workflow usi
Kubernetes Network Latency: A Segment-by-Segment Runbook from DNS and kube-proxy to MTU and eBPF
Find the cause of Kubernetes service-to-service latency by measuring each segment: DNS (ndots, 5-second delays), kube-proxy mode, overlay MTU, NetworkPolicy and sidecars. Symptom triage table, copy-paste commands, and eBPF tools.
Replacing iptables? How to Optimize Kernel Networking and Observability Performance with eBPF
The performance overhead and complexity of iptables now have an answer in eBPF. This in-depth analysis covers eBPF’s kernel-level operating principles, networking policies, and APM tracing, with a practical roadmap for fundamentally transfo
Resolving K8s NetworkPolicy Communication Errors: A Calico vs Cilium (iptables vs eBPF) Comparison Guide
This guide analyzes the root causes of NetworkPolicy failures by comparing how each CNI enforces policy (iptables vs eBPF). It then walks through a practical, step-by-step debugging workflow for capturing packets at the node level when Egre