As you learned earlier in this chapter in the section “Creating an End-System Network Configuration
Table,” there are many occasions when you need to execute commands on the end system
in order to get a clear picture of what is going on in the network. This is true not only for
the discovery of network information but also for the troubleshooting of network behavior.
Because the basic commands used for discovery were discussed earlier in the chapter, here in this
section we will focus specifically on the troubleshooting commands. You will notice that many
of the same commands are used for both troubleshooting and discovery.
In this section, the Unix versions of the commands are used for the Unix, Linux,
and MacOS X end-system types. There can be slight variations between the
Unix and the Linux/MacOS X versions of the commands. However, most are
very similar and in some cases identical to their Unix counterparts.