centos kernel version must 4.9 or newest
echo ‘net.core.default_qdisc=fq’ | sudo tee -a /etc/sysctl.conf
echo ‘net.core.default_qdisc=fq’ | sudo tee -a /etc/sysctl.conf
echo ‘net.ipv4.tcp_congestion_control=bbr’ | sudo tee -a /etc/sysctl.conf
sudo sysctl -p
sudo sysctl -p
sudo sysctl net.ipv4.tcp_available_congestion_control
sudo sysctl -n net.ipv4.tcp_congestion_control
