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15.4 Further Thoughts 15.5 Summary 15.6 Exercises PART 4 GOING FURTHER 16 True Intelligence: Adaptive Behavior 16.1 Adaptive Behavior

Figure 25-1: DNS server operation The names of the DNS servers that service a host's network are kept in the host's /etc/resolv.conf file. When setting up an Internet connection, the name servers provided by your Internet service provider (ISP) were placed in this file. These name servers resolve any fully qualified domain names that you use when you access different Internet sites. For example, when you enter a Web site name in your browser, the name is looked up by the name servers, and the name's associated IP address is then used to access the site.

If you are setting up a DNS server for a local area network (LAN) that is not connected to the Internet, you should use a special set of IP numbers reserved for such non-Internet networks (also known as private networks or intranets) This is especially true if you are implementing IP masquerading, where only a gateway machine has an Internet address, and the others make use of that one address to connect to the Internet For a class C network (254 hosts or less), these are numbers that have the special network number 192168, as used in these examples If you are setting up a LAN, such as a small business or home network, you are free to use these numbers for your local machines.

X and Y are required parameters that de ne the position on the screen to place the robot. Both X and Y have to be whole numbers and must be within the limits of the screen (800 600 pixels). If you try to place the robot off the screen it will be placed at the limit of the screen. Heading is optional and if it is not speci ed, 0 will be the default. Heading speci es the direction the robot will be facing (0 to 359 ) 0 is north, 90 is east, 180 is south and 270 is west. Intermediate headings like northwest would be 315 , and so on. If you need to specify the next parameter Size you must also specify the Heading. Size is optional and if it is not speci ed 20 pixels will be the default. You can specify a maximum of 50 pixels and a minimum of 5 pixels. If you try to specify a number for Size outside these limits the closest limit will be assumed. You must specify Heading and Size if you want to specify the next parameter Color.

You can set up a private network, such as an intranet, using network cards such as Ethernet cards and Ethernet hubs, and then configure your machines with IP addresses starting from 19216811 The host segment can range from 1 to 254, where 255 is used for the broadcast address If you have three machines on your home network, you can give them the addresses 19216811, 19216812, and 19216813 You can then set up domain name services for your network by running a DNS server on one of the machines This machine becomes your network's DNS server You can then give your machines fully qualified domain names and configure your DNS server to translate the names to their corresponding IP addresses As shown in Figure 25-2, for example, you could give the machine 1921681.

1 the name turtlemytrekcom, and the machine 19216812 the name rabbitmytrekcom You can also implement Internet services on your network such as FTP, Web, and mail services by setting up servers for them on your machines You can then configure your DNS server to let users access those services using fully qualified domain names For example, for the mytrekcom network, the Web server could be accessed using the name wwwmytrekcom Instead of a Domain Name Service, you could have the /etc/hosts files in each machine contain the entire list of IP addresses and domain names for all the machines in your network But, for any changes, you would have to update each machine's /etc/hosts file..