Simulating TCP loss and congestion in browser using Go/WASM

ccsim is an interactive browser-based network simulator that visualizes TCP congestion control behavior using full gVisor network stacks compiled to WebAssembly. It reproduces key figures from the original BBR paper, letting users compare CUBIC and BBRv3 across scenarios like bottleneck saturation, RTT vs. inflight data, and bandwidth step changes. The simulator demonstrates how naive senders cause congestion collapse, how CUBIC overshoots into loss to probe capacity, and how BBRv3 estimates path bandwidth to stay near the optimal operating point without building queues.

Source: https://ccsim.fly.dev. 8sync News only summarizes and links out; content copyright belongs to the authors and original sources.