While specific information on the DOD protocols is fairly
generally available’, 6. ‘, it is sometimes difficult to
determine the motivation and reasoning which led to the
In fact, the design philosophy has evolved considerably
from the first proposal to the current standards. For
example, the idea of the datagram, or connectionless
service, does not receive particular emphasis in the first
paper, but has come to be the defining characteristic of
the protocol. Another example is the layering of the
architecture into the IP and TCP layers.
This book is intended for beginning through intermediate users and covers all the
protocols involved in TCP/IP. Each protocol is examined in a fair level of detail to show
how it works and how it interacts with the other protocols in the TCP/IP family. Along
the way, this book shows you the basic tools required to install, configure, and maintain
a TCP/IP network. It also shows you most of the user utilities that are available.
These are charts from Ganymede Chariot used in a lab based on FIFO (no
queuing). TCP traffic was going all over the chart. With nothing controlling the
traffic, throughput is horrible and completely unpredictable!
With Traffic Shaping, Frame Relay DE bit setting, Class-Based Weighted Fair
Queuing (CBWFQ), and Weighted Random Early Detection (WRED) enabled, the
network is much more well behaved.
We’ll discuss CBWFQ and WRED in the Queuing module.
In this section we’ll look at techniques for Classification and Marking.