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Figure 6-8. As you select each item, the description box at the bottom of the dialog box explains how the item is used.
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Part 2: Keeping Your System Secure
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To specify ICMP settings for an individual connection, on the Advanced tab, select the network connection. Click Settings in the Network Connection Settings box, and then click the ICMP tab. The same list of ICMP options appears. (Actually, you might notice one difference: If the connection you selected does not support IPv6 and most do not at this time
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Microsoft Windows XP Inside Out, Second Edition the list doesn t include Allow Outgoing Packet Too Big, which is an IPv6-only option.) Any settings you make in this dialog box override the global settings you make in the dialog box shown in Figure 6-8.
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For more details about Ping, Tracert, and other essential utilities, see Network Troubleshooting Tools, page 897.
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Logging Firewall Activity
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When Windows Firewall blocks traffic, it doesn t display an (annoying) on-screen alert as some third-party personal firewalls do. However, you can configure Windows Firewall to store a record of its activity in a log file. To enable logging, follow these steps:
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1 In Windows Firewall, click the Advanced tab. 2 In the Security Logging box, click Settings. The Log Settings dialog box appears.
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3 Select the check boxes for the kinds of events you want to log dropped packets, successful connections, or both.
Log dropped packets only You ll get the most useful security information by logging only dropped packets, so that Windows Firewall records each connection that was blocked. Logging successful connections tends to create a large file with information that you probably don t need. A log of dropped packets, however, can lead you to IP addresses that are probing your computer and that you might want to act against.
4 Specify a file name for the log if you don t want to use the default (%SystemRoot%\ Pfirewall.log).
Part 2: Keeping Your System Secure
6
Part 1: Part Title
Security Essentials
5 To keep a log from getting too large, specify a maximum file size. 6 Click OK.
To read your log, open it in Notepad or another text editor. Figure 6-9 shows a sample of a Windows Firewall log.
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Figure 6-9.
A firewall log captures a lot more information than you ever thought you d need.
The log uses the W3C Extended Log format, a standard logging format that allows you to analyze data using third-party utilities. To understand what the columns mean, look at the column headers in line 4 (they don t align over the data below, but they re in the correct order). The most significant columns are the first eight, listed in Table 6-1.
Table 6-1.
The First Eight Columns of a Windows Firewall Log
Description
Year-Month-Date of occurrence Hour:Minute:Second of occurrence Operation logged by the firewall; possible values are OPEN, CLOSE, DROP and , INFO-EVENTS-LOST Protocol used for the communication; possible values are TCP UDP and ICMP , , IP address of the computer that initiated the communication IP address of your computer The port number of the sending computer
6
Item
Date Time Action
Protocol Source IP Destination IP Source Port Destination Port
Port that the sending computer tried to access on your computer
Part 2: Keeping Your System Secure
Microsoft Windows XP Inside Out, Second Edition
Inside Out
Use Microsoft Excel to view firewall logs Do you have Microsoft Office installed on your computer If so, skip Notepad and use Microsoft Excel to analyze Windows Firewall log files. After converting the space-delimited text file to Excel columns, you can sort, filter, and search the output. Try using Excel s AutoFilter capability to pick out specific IP addresses or ports from the log; this technique can help zero in on attackers quickly.
Controlling Windows Firewall with Group Policy
If you have Windows XP Professional, Group Policy provides another way to control Windows Firewall. And like the Netsh command (described in the following section), it allows you to do some things you can t do with the Control Panel application alone. To examine the available settings, at a command prompt type gpedit.msc to open Group Policy. Navigate to Computer Configuration\Administrative Templates\Network\Network Connections\Windows Firewall, which contains two folders, Domain Profile and Standard Profile. Why two profiles You might want different settings depending on whether your computer is connected to a corporate network or not. For example, with a portable computer you might want the firewall locked up tight while you re not traveling or working at home, but have exceptions for certain programs when you re using the corporate network. Windows Firewall uses the settings specified in the Domain Profile folder whenever your computer is joined to a domain; it uses the settings in the Standard Profile folder at all other times. The available settings, which you can examine by clicking either folder, are the same in each folder. Select a policy to display information about how it works; double-click it to make settings. Note
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