First, check whether BBR is already enabled on your system:

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sysctl net.ipv4.tcp_congestion_control

If the output shows tcp_congestion_control = cubic, it means BBR is not enabled yet.

Run the following two commands to enable BBR:

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

Then apply the new settings:

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sudo sysctl -p

Verify again:

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sysctl net.ipv4.tcp_congestion_control

If the output shows tcp_congestion_control = bbr, it means BBR is successfully enabled.

You can also confirm that the BBR module is active:

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lsmod | grep bbr

If you see bbr in the output, it means BBR is running and working properly ✅