测试环境：Vultr Ubuntu16.04
选择默认镜像开启后，自动安装为 16.04.3 LTS
1) 更新软件源，更新到推荐版本系统内核
apt-get update apt-get -y install aptitude aptitude -y upgrade apt-get -y autoremove
2) 更新linux系统内核版本后重启 确保大于4.9
mkdir kernel && cd kernel wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9.98/linux-headers-4.9.98-040998_4.9.98-040998.201805021530_all.deb wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9.98/linux-headers-4.9.98-040998-generic_4.9.98-040998.201805021530_amd64.deb wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9.98/linux-image-4.9.98-040998-generic_4.9.98-040998.201805021530_amd64.deb dpkg -i *.deb reboot
3) 添加配置以使BBR生效
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 # 查看内核是否已开启BBR lsmod | grep bbr # 查看BBR是否启动