how to enable TCP BBR in ubuntu 18.04 LTS?

Question

I have added the following lines to the /etc/sysctl.conf :

net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr

also my kernel version on the ubuntu 18.04 TLS version is 4.15.0-65-generic with the uname -r showing it.

I am getting the following error when using the sysctl -p to reload sysctl configurations:

sysctl: cannot stat /proc/sys/net/core/default_qdisk: No such file or directory

also the current available TCP congestion control algorithm is cubic and reno which the cubic is active.

Answer 1

I have found some links below that helped me solve the problem:

- https://github.com/cbeuw/Cloak/issues/11

- https://www.cyberciti.biz/cloud-computing/increase-your-linux-server-internet-speed-with-tcp-bbr-congestion-control/

- https://www.jwtechtips.top/install-tcp-bbr-on-linux-in-1-step/

all of these 3 links solve the problem the same way. i did not delete the question after solving it so if anyone else got stuck could hopefully solve it like I did.