When we buy a new VPS, we usually test the network connection speed, but the newly opened machines are generally not optimized for the system, so the upload and download speed will be reduced, then we need to open BBR for it to speed up access speed.

# Advantages and disadvantages of BBR

Google BBR (Bottleneck Bandwidth and RTT) is a congestion control algorithm used to optimize the speed of data transmission in the network. advantage: 1. Improve network efficiency: Google BBR improves the efficiency of data transmission by monitoring network bandwidth and delay (RTT) in real time. 2. Reduce congestion: Google BBR controls the data transmission rate in a more sensitive manner by monitoring network bandwidth and delay, thereby reducing congestion. 3. Improve transmission speed: Since Google BBR can effectively use network resources, it can increase transmission speed.

shortcoming: 1. High implementation complexity: Google BBR is a relatively new technology, and it is relatively complicated to implement, especially for existing network equipment. 2. Not applicable to all network environments: Google BBR may not be applicable to all network environments. For example, in some cases, due to the particularity of the network environment, BBR may not be able to perform optimally.

# Enable BBR

Overall, Google BBR is an effective congestion control algorithm that can improve network efficiency, reduce congestion, and increase transmission speed to a certain extent.

Next I will show how to enable BBR. If your system is Debian, Ubuntu, CentOS, enter the following code on the command line page:

echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
sysctl -p

Then restart the system:

sudo reboot

In the last step, use the following command to check whether the system has been enabled.

lsmod | grep bbr

If it returns as shown in the figure below, BBR has been enabled.