Christian WellsIn the world of Linux, the performance of your web browsing experience is greatly influenced by the congestion control system and the bandwidth available. By default, Linux utilizes the Reno and CUBIC congestion control algorithms. However, there is an alternative option that can enhance your web surfing experience even further – TCP BBR (Bottleneck Bandwidth and RTT).
In this article, we will guide you through the process of enabling TCP BBR on your AlmaLinux 8 system. TCP BBR is known for its ability to optimize network congestion, resulting in faster and smoother web browsing. Before diving into the steps, let’s first understand the requirements and how to check the current congestion control algorithm used in your system.
Requirements
To enable TCP BBR on your AlmaLinux 8 system, you need to ensure that you have a Linux kernel version of 4.9 or above. Fortunately, AlmaLinux 8 comes with the 4.18.0 kernel, which meets this requirement. Now, let’s move on to checking the available congestion control algorithms on your system.
Checking Available Congestion Control Algorithms
To check the available congestion control algorithms, open your terminal and execute the following command:
sysctl net.ipv4.tcp_available_congestion_control
You will see an output similar to the following:
net.ipv4.tcp_available_congestion_control = reno cubic
The output displays the currently available congestion control algorithms, which in this case are “reno” and “cubic”. Reno and CUBIC are the default algorithms used by Linux.
Checking the Current Congestion Control Algorithm
To determine the current congestion control algorithm used in your system, run the following command:
sysctl net.ipv4.tcp_congestion_control
The output will show you the currently active congestion control algorithm. For example:
net.ipv4.tcp_congestion_control = reno cubic
In this case, the system is using the “reno” algorithm.
Now that we have checked the current congestion control algorithm and confirmed the availability of TCP BBR, let’s proceed with enabling TCP BBR on your AlmaLinux 8 system.
Enabling TCP BBR
To enable TCP BBR, you need to modify the system’s configuration file. Open the terminal and run the following command to open the configuration file:
vi /etc/sysctl.conf
This command opens the /etc/sysctl.conf file in the vi editor. Scroll down to the end of the file and add the following lines:
net.core.default_qdisc=fq net.ipv4.tcp_congestion_control=bbr
These lines configure the default queuing discipline to “fq” and set the congestion control algorithm to “bbr”. Once you have added these lines, save the file and exit the editor.
To apply the changes and refresh the configuration, execute the following command:
sysctl -p
The output will display the applied changes:
net.core.default_qdisc = fq net.ipv4.tcp_congestion_control = bbr
Congratulations! You have successfully enabled TCP BBR on your AlmaLinux 8 system.
Verifying TCP BBR Status
To verify whether TCP BBR is enabled in your system, run the following command:
sysctl net.ipv4.tcp_congestion_control
The output will confirm the activation of TCP BBR:
net.ipv4.tcp_congestion_control = bbr
With TCP BBR enabled, you can now experience an improved web surfing experience on your AlmaLinux 8 system.
Conclusion
In this article, we have explored the process of enabling TCP BBR on your AlmaLinux 8 system. By modifying the system’s configuration file and applying the necessary changes, you can enhance your web browsing experience with optimized network congestion. TCP BBR allows for faster and smoother web surfing, ensuring a more efficient and enjoyable online experience.
Remember, TCP BBR requires a Linux kernel version of 4.9 or above. AlmaLinux 8, with its 4.18.0 kernel, meets this requirement, making it an ideal choice for enabling TCP BBR. By following the steps outlined in this article, you can unlock the benefits of TCP BBR and enjoy a seamless web browsing experience.
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