The article explains how Baidu’s open‑source evr tool leverages VXLAN VTEP reflection to monitor Edge Virtual Routers from a single side, detailing packet construction, payload encoding, raw‑socket handling, BPF filtering, ECMP coverage, and practical configuration for reliable loss, latency, and bit‑flip detection.
The article introduces Lidar, Baidu’s new open‑source TCP‑SYN based network monitoring system, explains why the classic PingMesh approach is unsuitable for large data‑center environments, and details Lidar’s design, implementation quirks across Linux and macOS, BPF filtering, source‑port rotation for ECMP coverage, and practical usage examples.
This article introduces the open‑source traffic‑replay tool TCPCopy, explains its 1.0 architecture—including the tcpcopy and intercept components—covers its packet‑capture and injection methods (raw socket vs pcap), TCP state handling, routing challenges, intercept role, and performance characteristics, providing practical insights for backend testing and operations.
