Enable BBR on Linux Server

Sep 24, 2024#bbr #linux15

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BBR is a new TCP congestion control algorithm designed to improve network connections, such as proxies. It is integrated into Linux Kernel 4.9 and later, requiring no manual installation. To check available TCP control algorithms, use the command `sysctl net.ipv4.tcp_available_congestion_control`. To enable BBR, add the lines `net.core.default_qdisc=fq` and `net.ipv4.tcp_congestion_control=bbr` to the `/etc/sysctl.conf` file. Some cloud providers, like DMIT, may have BBR pre-configured. You can verify the configuration with `sysctl net.ipv4.tcp_congestion_control`, which should return `net.ipv4.tcp_congestion_control = bbr` if successful.

BBR is a new TCP congestion control algorithm commonly used to improve network connections such as proxies.

Prerequisites#

In Linux Kernel 4.9 and above, BBR is automatically integrated into the system, requiring no manual installation by the user.

Enter the following command to view the available TCP congestion control algorithms:

sysctl net.ipv4.tcp_available_congestion_control

Enable the Algorithm#

Open the /etc/sysctl.conf file with any editor and add the following two lines:

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

Some cloud service providers, such as DMIT, have BBR configured when initializing the server. You can use the following command to check:

sysctl net.ipv4.tcp_congestion_control

Finally, here is the result after successful configuration:

root@vmi819506:~# sysctl net.ipv4.tcp_congestion_control 
net.ipv4.tcp_congestion_control = bbr