Changing Linux default TCP Congestion control

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Commands required to change default Linux congestion control to Google BBR:

Check actual values:
  • sudo sysctl net.core.default_qdisc
  • sudo sysctl net.ipv4.tcp_congestion_control

Edit sysctl.conf
  • sudo nano /etc/sysctl.conf

Add values at the end:
  • net.core.default_qdisc=fq
  • net.ipv4.tcp_congestion_control=bbr


Apply Kernel values without restarting:
  • sudo sysctl -p
See it applied to traffic:
  • ss -tin



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