I'd like to know more about origin of br0 as many tutorials refer to it but don't explain how does it come into existence.

Is it coming from some kernel module/driver? Is it always available?


1 Answer 1


Based on default route of br0 gets dev eth0 instead of dev br0 it's a network bridge device.

You set it up like you would a network interface. Looking at the kernel source, it was started in 2001.

More information can be found at:

  • brctl show 查看网桥状态
    – CS QGB
    Dec 19, 2022 at 13:46

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