echo net.core.default_qdisc=fq >> /etc/sysctl.conf
echo net.ipv4.tcp_congestion_control=bbr >> /etc/sysctl.conf
sysctl -p
sysctl net.ipv4.tcp_available_congestion_control
lsmod | grep bbr
sysctl net.ipv4.tcp_available_congestion_control
# net.ipv4.tcp_available_congestion_control = bbr cubic reno