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Earlier in the chapter, we learned that a TCP/IP packet over Ethernet was a series of headers for each protocol, followed by the actual data being sent Packet headers, as they are typically called, are simply those pieces of information that tell the protocol how to handle the packet In this section we look at each of these headers (Ethernet, IP, TCP, UDP) using the tcpdump tool Most Linux distributions have it preinstalled, but if you don t, you can quickly install it using the package management suite in your Linux distro NOTE You must have superuser privileges in order to run the tcpdump command

The type float specifies a single-precision value that uses 32 bits of storage Single precision is faster on some processors and takes half as much space as double precision, but will become imprecise when the values are either very large or very small Variables of type float are useful when you need a fractional component, but don t require a large degree of precision For example, float can be useful when representing dollars and cents Here are some example float variable declarations:

float hightemp, lowtemp;

Ethernet has an interesting history As a result, there are two types of Ethernet headers: 8023 and Ethernet II Thankfully, although they both look similar, there is a simple test to tell them apart Let s begin by looking at the contents of the Ethernet header (see Figure 11-4) The Ethernet header contains three entries: the destination address, the source address, and the packet s protocol type Ethernet addresses also called Media Access Control (MAC) addresses; no relation to the Apple Macintosh are 48-bit (6-byte) numbers that uniquely identify every Ethernet card in the world Although it is possible to change the MAC address of an interface, this is not recommended, as the default is guaranteed to be unique, and all MAC addresses on a LAN segment should be unique NOTE A packet that is sent as a broadcast (meaning all network cards should accept this packet) has the destination address set to ff:ff:ff:ff:ff:ff The packet s protocol type is a two-byte value that tells us what protocol this packet should be delivered to on the receiver s side For IP packets, this value is hex 0800 (decimal 2048) The packet we have just described here is an Ethernet II packet (Typically, it is just called Ethernet) In 8023 packets, the destination and source MAC addresses remain in place; however, the next two bytes represent the length of the packet The way you can

Double precision, as denoted by the double keyword, uses 64 bits to store a value Double precision is actually faster than single precision on some modern processors that have been optimized for high-speed mathematical calculations All transcendental math functions, such as sin( ), cos( ), and sqrt( ), return double values When you need to maintain accuracy over

3:

Full Ethernet Packet (46 1500 bytes) RFC 894 requires the minimum length to be 46 bytes Destination Address 6 Source Address 6 Type 2 Data Up to 1486 bytes CRC 4

many iterative calculations, or are manipulating large-valued numbers, double is the best choice Here is a short program that uses double variables to compute the area of a circle:

// Compute the area of a circle class Area { public static void main(String args[]) { double pi, r, a; r = 108; // radius of circle pi = 31416; // pi, approximately a = pi * r * r; // compute area Systemoutprintln("Area of circle is " + a); } }

11:

Figure 1-1. My bot SPOT Can we all agree that SPOT is a fairly boring robot We all know that robots should do things! You could almost say that SPOT needs to be trained. That s how I m going to define the word program. Read the next two sentences slowly: A program is a set of instructions for my robot. Programming is what you do when you create a program. It s not a long definition, and it certainly isn t complicated. The definition will get a little more detailed as you read more chapters, but for now, let s just start out with that very basic idea.