TCP Congestion Visualizer

Click Play to start the simulation

Speed: 1x

Keyboard: Space Play/Pause | ← Fast | ↓ Normal | → Slow

Buffer Configuration

Buffer Mode:

Auto (BDP) Manual Adaptive

Buffer Size: packets

Current: 8 packets

Metrics

Buffer Occupancy: 0/8

Current RTT: 0ms

Queueing Delay: 0.00ms

Sender A CWND: 1

Sender B CWND: 1

TCP State A: Slow Start

TCP State B: Slow Start

Packets Dropped: 0

Link Utilization: 0%

About This Visualization

This demonstrates TCP's AIMD (Additive Increase, Multiplicative Decrease) congestion control algorithm. Two senders compete for the same bottleneck link, each increasing their congestion window linearly until packets are dropped at the router buffer, then halving the window—creating interleaved "sawtooth" patterns.