bpftool:tldr:06dff

The command "bpftool feature probe dev ${eth0}" is used to probe the features supported by a network device.

Here is a breakdown of the command:

• "bpftool" is a command-line utility used to interact with the BPF (Berkeley Packet Filter) subsystem in the Linux kernel.
• "feature" is a subcommand of "bpftool" used to probe the features of a device.
• "probe" is the action to be performed on the device.
• "dev" specifies that the device to be probed is a network device.

"${eth0}" is a variable substitution where "eth0" represents the name of the network device. The actual device name may vary depending on the system configuration.

Overall, this command is used to check the BPF features supported by the network device specified (usually the eth0 interface). It provides information about the capabilities of the device, such as packet filtering, traffic classification, and other BPF-related features.