BBR (Bottleneck Bandwidth and Round-trip propagation time) is a congestion control algorithm developed by Google to improve network performance by optimizing data flow. It replaces traditional congestion control methods like Reno and CUBIC, significantly enhancing throughput and reducing latency in high-bandwidth, high-latency networks.

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Key Features of BBR

1. Higher Network Throughput
   • BBR optimizes packet transmission, maximizing bandwidth usage and improving data transfer speeds.
2. Lower Latency
   • Unlike traditional congestion control algorithms, BBR reduces delays caused by unnecessary packet buffering.
3. Fairer Bandwidth Allocation
   • Ensures better distribution of network resources, preventing bandwidth monopolization by certain flows.
4. Better Performance in High-Latency Networks
   • Especially useful for cloud servers, gaming, video streaming, and large-scale web applications.
5. Adaptive to Network Conditions
   • Continuously adjusts to real-time network conditions, optimizing performance dynamically.
6. Kernel-Level Implementation
   • Integrated into modern Linux kernels (4.9+), allowing direct activation without third-party tools.

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Advantages of BBR

• Faster Downloads and Streaming: Ideal for content delivery networks (CDNs), video streaming, and online gaming.
• Improved Cloud and Server Performance: Commonly used by Google Cloud, AWS, and high-performance web applications.
• Reduced Network Congestion: Ensures smoother network performance by minimizing packet loss and retransmissions.
• Optimized TCP Performance: Works efficiently even in high-latency or lossy networks, outperforming traditional TCP congestion control methods.

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What You Can Do with BBR

1. Enhance Web Server Performance
   • Improves TCP traffic handling, making websites load faster.
2. Improve Network Efficiency for Cloud Applications
   • Boosts performance for Google Cloud, AWS, Azure, and other cloud-based workloads.
3. Optimize Gaming and Streaming Services
   • Reduces buffering and lag, providing a smoother experience for online services.
4. Increase VPN and Remote Access Speed
   • Helps maintain stable and fast connections for VPN users and remote workers.
5. Reduce Packet Loss in High-Latency Networks
   • Improves reliability for long-distance and satellite-based connections.

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BBR vs. Other Congestion Control Algorithms

Feature	BBR	CUBIC	Reno
Throughput	✅ High	⚠️ Moderate	❌ Low
Latency	✅ Low	❌ Higher	❌ Higher
Packet Loss	✅ Handles Well	❌ Less Efficient	❌ Poor Handling
Adaptability	✅ Dynamic	⚠️ Limited	❌ Rigid

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Why Enable BBR on Ubuntu 24.04?

BBR is an excellent choice for improving network speed, efficiency, and stability, especially for cloud servers, VPNs, and high-traffic web applications. Enabling BBR helps achieve faster data transfer rates, lower latency, and a smoother internet experience, making it a must-have for modern networking environments.

Step 1: Create a Server Instance on Shape.Host

Before enabling BBR, you need a server to host your environment. Here’s how to set up a server instance on Shape.Host:

Access Shape.Host: Log in to your Shape.Host account and navigate to the Cloud VPS section.

Launch a New Server: Click on “Create” and select the server type that best suits your project requirements.

Choose a Data Center: Pick a data center location that is closest to your target audience for optimal performance.

Select a Plan: Choose a hosting plan that aligns with your resource needs and budget.

Set the OS: Select Ubuntu 24.04 as your operating system.

Finalize the Setup: Review your configuration and click “Create” to deploy your instance. Your server will be ready in a few minutes.

In Dashboard you will find your IP

Step 2: Connect to Your Instance

Once your server is ready, you need to connect to it using SSH. Here’s how to do it:

• Linux/macOS: Open your terminal and use the following command:

  ssh root@your_server_ip

Replace your_server_ip with the server’s IP address.

• Windows: Use an SSH client like PuTTY. Enter your server’s IP address, specify the port (usually 22), and click “Open.” Log in with your username and password.

Step 3: Update the System

Before making any changes, it’s a good practice to update your system to ensure all packages are up to date. Run the following command:

apt update

Step 4: Check Current Congestion Control

Check the currently available congestion control algorithms:

sysctl net.ipv4.tcp_available_congestion_control

Check the currently active congestion control algorithm:

sysctl net.ipv4.tcp_congestion_control

Step 5: Enable BBR

To enable BBR, you need to modify the sysctl.conf file. Open the file for editing:

nano /etc/sysctl.conf

Add the following lines to the end of the file:

net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr

Save and close the file.

Step 6: Apply the Changes

Apply the changes by running the following command:

sysctl -p

Step 7: Verify BBR is Enabled

Verify that BBR is now the active congestion control algorithm:

sysctl net.ipv4.tcp_congestion_control

You should see the following output:

net.ipv4.tcp_congestion_control = bbr

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