#修改系统变量

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

#保存生效

sysctl -p

#查看内核是否已开启BBR

sysctl net.ipv4.tcp_available_congestion_control

#显示以下即已开启:

# sysctl net.ipv4.tcp_available_congestion_control
net.ipv4.tcp_available_congestion_control = bbr cubic reno

#查看BBR是否启动

lsmod | grep bbr
#显示以下即启动成功:
root@debian:# lsmod | grep bbr
tcp_bbr 20480 5