8.2. Host-Monitoring Tools
We have already discussed
host-monitoring tools in several different parts of this book,
particularly Chapter 2, "Host Configurations"
and Chapter 4, "Path Characteristics"
. An obvious example of a host-monitoring tool
. You will recall that the
option will give a cumulative picture of the
traffic into and out of a computer.
Although easy to overlook, any tool that
logs traffic is a host-monitoring tool of sorts. These are generally
not too useful after the fact, but you may be able to piece together
some information from them. A better approach is to configure the
software to collect what you need. Don't forget applications,
like web servers, that collect data. Accounting tools and security
tools provide other possibilities. Tools like
all support logging. (Log files are
discussed in greater detail in Chapter 11, "Miscellaneous Tools"
Host-monitoring tools can be essential in diagnosing problems related
to host performance, but they give very little information about the
performance of the network as a whole. Of course, if you have this
information for every host, you'll have the data you need to
construct a complete picture. Constructing that picture is another
|8. Performance Measurement Tools||8.3. Point-Monitoring Tools|