You can find out a lot about your network by using a variety of different tools. Understanding the layout of your network, and where packets are going, and what people are doing is important. This tutorial examines techniques for monitoring the traffic and content of your UNIX network and how to read and diagnose problems on your network.
If you’ve ever wondered why when you’ve typed ‘ifconfig’ recently you don’t get all of your IP addresses for an interface up amongst other things that is because it has been largely unmaintained and deprecated by ‘ip’. To do that you would do ‘ip addr show’.
‘ip’ is a bit of a Swiss army knife of a network command and an up to date overview of that would have been better.
The article is about Unix networking in general, not Linux networking. ifconfig is in no way unmaintained and deprecated on non-Linux *nix platforms.
The article is clearly split into sections that are Linux specific and implementations on other systems such as Mac OS and Solaris. I did think people might be wise enough to figure all that out, but obviously not.
Ah, then it would be pertinent to mention “ip” in that secton.