Linux · Network Diagnostics

Both ping and traceroute exist, so what does mtr give you that running either one alone doesn't?

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More in Network Diagnostics

You want a quick look at the IP addresses under which a Linux box is reachable, but plain hostname only prints the name. Which invocation filters out the relevant addresses, and what is easy to type wrong?

In ip link output the first interface is always lo. What is it, and why does it appear on a machine with no network hardware at all?

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