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Figure 31-9 A firewall log captures a lot more information than you ever thought you d need. Table 31-1. Windows Firewall Log Content
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Column Date Time Action Protocol Src-ip Dst-ip Src-port Dst-port Size TCPFlags TCPSyn TCPAck TCPWin
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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 Source IP; IP address of the computer that initiated the communication Destination IP; IP address of your computer Source port; the port number of the sending computer Destination port; port that the sending computer tried to access on your computer The size of the packet in bytes The protocol flags such as SYN, ACK, RST, and so on The TCP sequence number, if any, in the packet The acknowledgement number, if any, in the packet The Window Size in the packet header
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Column ICMPType ICMPCode Info Path
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Description The ICMP Code from the header Any information available about the packet The direction that the packet is heading 31 The Type Code of the ICMP header
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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 spacedelimited text file to Excel columns, you can sort, filter, and search the output. Try using Excel s Filter capability to pick out specific IP addresses or ports from the log; this technique can help zero in on attackers quickly.
Using the Netsh Command to Manage Windows Firewall
If you need to make firewall settings repeatedly on a single computer as conditions change or, perhaps, on a eet of computers you ll find working with Windows Firewall (the Control Panel application) or Windows Firewall With Advanced Security to be a bit cumbersome. The Netsh command, using its Firewall or Advfirewall context, provides an alternative way to view or modify all manner of Windows Firewall settings. For example, you can enable Windows Firewall with this command:
netsh firewall set opmode enable
The Netsh Firewall context might be considered the basic context, where you can find current firewall settings at a high level. It s roughly comparable to the Windows Firewall application in Control Panel. From the command prompt you can see the basic configuration by typing:
netsh firewall show config
To see more details about the configuration use the Advfirewall context the commandline counterpart to Windows Firewall With Advanced Security. The Advfirewall context contains three subcontexts: Consec, Firewall, and Monitor. The Firewall subcontext can be used to show the rule details for specific (or all) rules or set new values for existing rules. You can also add rules on the y using this subcontext. The Consec subcontext is used to work with connection security rules on the computer. The Monitor subcontext is used to view and set security associations. To view all of the rules within Windows Firewall from the command line (be prepared for a lot of output) type:
netsh advfirewall firewall show rule name=all
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With dozens of keywords and options, the Netsh Firewall and Netsh Advfirewall commands are quite complex. The best way to learn about the various possibilities is through the help available from the command line. You ll need to do it in several steps, appending another keyword each time. For example, start by entering netsh rewall at a command prompt. This returns a list of each of the keywords that you can put after rewall Add, Delete, Dump, Help, Reset, Set, and Show along with a brief description of each. Next you might type netsh rewall set to learn about each of the Set options. Then you d type netsh rewall set opmode and so on, until you reach a screen that shows the command syntax and explains all the parameters for the command you ve entered.
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