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Allows packets to be transmitted without IPSec protection. For example, Simple Network Management Protocol (SNMP) includes support for devices that might not be IPSec aware. Enabling IPSec for SNMP would cause a loss of network management capabilities for these devices. In a highly secure network, you could create an IPSec filter for SNMP and set the IPSec action to Permit to allow SNMP packets to be transmitted without IPSec protection.

on which it s running and can slow that system down, thus reducing system performance and also possibly skewing the data being collected. Therefore, it s best to use it only when trying to gather specific data, and its potential effect on the computer s performance must be remembered when analyzing the data.

Discards packets. If the associated IPSec filter is matched, all packets with the block action defined are discarded.

If you see only events in the Properties window, click the Properties button at the top of the Properties window.

Negotiate Security Allows an administrator to define the desired encryption and integrity algorithms to secure data transmissions if an IPSec filter is matched.

Figure 19-6

Microsoft has traditionally released update packages for Windows NT and Windows 2000 called service packs. These service packs combine fixes for bugs and security flaws as well as new features and functionality. Microsoft continues this tradition with Windows XP Service Pack 1 (SP1). Windows XP SP1 includes more of the fruits of Microsoft s Trustworthy Computing Initiative (see 20, Maintaining Network Security, for more details). SP1 includes fixes for security vulnerabilities found throughout both Microsoft Windows XP and the applications (such as Windows Messenger) included with Windows XP. Many of these fixes were made available as hotfixes before the release of SP1. However, SP1 also includes additional patches and refinements. In addition, Windows XP SP1 includes enhancements to system reliability, built-in support for a wider range of hardware, and the Microsoft .NET Framework, a software component that is key to applications developed in Microsoft s new .NET component environment.

In addition to these three basic actions, you can define settings that indicate how the computer will react if non-IPSec-protected data is received and how frequently new session keys are defined to protect the IPSec data. Options include the following:

Accept Unsecured Communication, But Always Respond Using IPSec You use this option when the IPSec protection is enforced only at the servers, not at the clients. In a typical IPSec deployment, clients are configured to use IPSec if requested by the server but to never initiate an IPSec SA. This setting allows the initial packet to be received by the server, which then starts the IKE process to negotiate an SA between the client and the

The most important network-related change in Windows XP SP1 affects how Windows XP manages default applications for common Internet-related tasks. By default, Windows XP includes Microsoft Internet Explorer for Web browsing, Microsoft Outlook Express for e-mail and newsgroup browsing, Microsoft Windows Media Player, and

Part III:

server. Although it is riskier to have the initial packet of a data transmission accepted by using plaintext, the response packet sent from the server will not be transmitted until an SA is established.

Allow Unsecured Communication With Non-IPSec-Aware Computers In a mixed network, this option allows non-IPSec-aware clients to connect to the server. Clients running Windows Server 2003, Windows 2000, and Windows XP, if configured to do so, will connect to the server and negotiate IPSec protection. Non-IPSec-aware clients will still be allowed to connect by using unprotected data streams. Session Key Perfect Forward Secrecy Using Perfect Forward Secrecy ensures that an existing key is never used as the foundation of a new key. When you use Perfect Forward Secrecy, all keys are generated without using existing keys. This reduces the risk of continual data exposure should a key be compromised because previous keys cannot be used to determine future keys.

Microsoft s Java virtual machine. Third-party applications can be installed to perform these tasks, but often Windows opens Microsoft tools by default to perform these tasks even after third-party tools are installed. Windows XP SP1 includes a new component in Add Or Remove Programs in Control Panel. It appears in the left pane of the Add Or Remove Programs dialog box and is named Set Program Access And Defaults. To access it, open Add Or Remove Programs in Control Panel, and click Set Program Access And Defaults, as shown in Figure A-1.