birt upc-a

birt upc-a

birt upc-a

birt upc-a

birt upc-a,

birt upc-a,

birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,

birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,

birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,
birt upc-a,

On the left side of the Preferences window, click ICMP Filtering. Then click the Enable ICMP Filtering check box, as shown in Figure 8-18. Don t put a check in any of the boxes underneath, unless you specifically want to permit one of the services.

This file can be offered by a Trivial FTP (TFTP) server, which is just a very simple FTP server that you can configure to hand out files in a convenient way to nodes on the network Just enable the TFTP server as a part of your xinetd configuration (see Starting Services with xinetd later in this chapter), and then put the file with the name mentioned here in the directory /tftpboot (which you ll have to create manually) and the host will be capable of downloading this file The filename option is useful for diskless workstations, as it allows them to download a boot image If a client is booting from a boot image file that has been delivered by a server, it can be useful for the client to know what server it s dealing with.

1. See my design book, Beginning Database Design: From Novice to Professional (Apress, 2007). 169

Figure 8-18. By deactivating traceroute, ping, and other services, you can add extra protection to your PC. 3. Click the Accept button to finish.

To specify this, the server-name option is used in the host definition for passacaglia It should contain the name of your DHCP server The last new option that you see here is fixed-address, which is used to pass a fixed IP address to the client If DNS is set up correctly, a resolvable DNS name can be used as well..

There s a fine line between security and paranoia. Using Firestarter gives you the opportunity to ensure that your system is secure, without needing to constantly reassess your system for threats and live in fear. When considering your system security, remember that most burglars don t enter a house through the front door. Most take advantage of an open window or poor security elsewhere in the house. In other words, when configuring your system s security, you should always select every option and extra layer of security, even if it might not appear to be useful. You should lock every door and close every window, even if you don t think an attacker would ever use them. If a security setting doesn t impact your ordinary use of the computer, you should select it. For example, deactivating the ping response of your computer might sound like a paranoid action, but it s useful on several levels. First, it means your computer is less easy to detect when it s online. Second, and equally important, it means that if there s ever a security flaw in the ping tool (or any software connected with it), you ll be automatically protected. This illustrates how you must think when configuring your system s security. Try to imagine every situation that might arise. Remember that you can never take too many precautions!