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The short phrase packet inspection describes exactly what a firewall does. That said, packet inspection covers many types of examination starting at the IP packet level, continuing through to UDP and TCP transport payloads, and sometimes extends all the way into the headers (and on some occasions, even the payloads) of Application-layer packets. Firewalls inspect this information carefully to look for illegal, unwanted, or potentially dangerous IP addresses, protocols, port numbers, or patterns of activity. Firewalls can be configured to block all unused protocols and to protect your ports. Some firewalls attempt to block all traffic that might indicate that an attack is either imminent or under way. Other firewalls can block access to certain domain names for outgoing traffic, either to enact workplace acceptable use policies or to offer families a means to block access to inappropriate or prurient materials. But all this capability hinges on a firewall s ability to look inside the traffic passing through it, and then to apply a set of rules as to what s allowed to pass through and what s not. Firewalls also work very well to protect systems and networks from scans and other attempts to snoop, attack, and even penetrate them. Kind of makes packet inspection sound a bit less dull and boring, doesn t it The section that follows takes a look at some top personal firewall picks, and explains what makes them so common, popular, or both. After that, I walk you through a firewall installation and then explore some scanning tools you can use to check your system s (and firewall s) security. It s time to put all this newfound TCP/IP knowledge to work!

We complete this book with a topic that we all hope we never need to worry about, but all need to know. It is nearly impossible to run a LAN full time with nothing ever going wrong. Even the most carefully designed networks experience issues. As a matter of fact, when designing your network, you decided on your acceptable level of risk for such issues. Now that your network is operational, it s your actions, both proactive and reactive, that are going to get you out of trouble quickly when problems occur within the LAN. No two LANs are alike. Even if they are alike in design, operationally they are their own entities. There is no one x-all for any particular issue within the LAN. The complexities of today s networks (high-speed data transfer, complex end-user application, etc.)1 complicate the troubleshooting process even more. This is why we nd ourselves (us writing and you reading) with this chapter. It s not a troubleshooting bible, but it is a guide that you can use to help you get a feel for 1) what is out there, and 2) a little of what you can expect. We hope it gives you the upper hand when you rst approach troubleshooting and serves as a useful reference for you in the future. The quote used for this section, Dif culties exist to be surmounted, seemed like a perfect thing to remember when taking on the challenge of an issue that has reared its ugly head. The more that we thought about the quote,

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Figure 15-30: Three examples of childishly simple layer effects applied creatively to character masks

Figure 10-6 shows the results of applying two filters discussed in this chapter Unsharp Mask and Motion Blur when the image is anchored in place and when it s layered. In all cases, the 2-pixel border was not selected. In the left examples, the Unsharp Mask filter leaves a high-contrast residue around the edge of the image, while Motion Blur duplicates the left and right edges of the border. Both problems vanish when the filters are applied to layered images, as seen on the right. Even if the area outside the selection is not a border per se perhaps it s just a comparatively dark or light area that serves as a visual frame layering comes in handy. You should always layer the selection unless you specifically want edge pixels to be calculated by the filter.

Choose a text style from the Text Style drop-down list. If you don t have a suitable text style, click the ellipsis button to the right of the drop-down list to open the Text Style dialog box. You can then define a text style. When you re done, close the Text Style dialog box and your new text style is available in the New Table Style dialog box. Enter a text height in the Text Height box. Choose a text color from the Text Color drop-down list. The default is ByBlock, which means that the text color is the same as the actual table which is a block. (I explain blocks and the ByBlock attribute in 18.) You can also choose ByLayer, which gives the text the properties of the current layer. Use the Fill Color drop-down list to specify the background color of the cells. The default is None, which shows the background color of your drawing area. Use the Alignment drop-down list to specify the text alignment within each cell. For example, you might want to use Middle Center for the title and column headings, and Middle Left for the data cells.

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