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Windows XP includes a number of command-line tools to diagnose local and remote network issues. These tools are covered in detail in Using Command-line Tools Included in Windows XP, page 345. Not only are these tools useful for determining whether computers or networks are functioning, but also for detecting network performance issues. When a networking problem is first detected, it s often wise to use Ping and PathPing to begin your troubleshooting process. By pinging a remote computer, you can determine the amount of time required for traffic to travel between the two computers. If this value seems large, you can isolate where the slowdown is taking place by using PathPing, which will ping every host that routes traffic between your computer and the remote target. If all hosts take a long time to respond, the problem most likely lies with your computer, your local network, or with your connection to the Internet. If, however, some hosts respond quickly and others do not, you can determine which are acting as bottlenecks on the particular connection you are trying to troubleshoot. Netstat is also a powerful tool for network troubleshooting on individual computers. If networking in general on a particular system seems slow, or one network server application such as Internet Information Services (IIS) on a particular computer seems slow, Netstat can determine if that computer is being flooded with connections and requests, and can show which applications are serving each of those requests.

When the status strip and the progress bar are displayed to the user, they usually display important information about the events that are occurring during the execution. Think of it like a letter arriving at your house. You hear the mail truck and realize the mail has arrived. This is the event that is raised. You open your mailbox and the envelope to learn that it s your credit card bill. The bill is one of the pieces of information that comes along with the event. To analogously populate the controls in the status strip, you ll have to configure your application to extract this information from all controls (that is, the envelope) when events are happening (that is, the mail truck arriving). And you ll do that programmatically by writing code in event handlers.

Determines how often TCP attempts to verify that an idle connection is still intact by sending a keep-alive packet. If the remote computer is still active, it will respond and the session will remain open. Keep-alive packets are not automatically sent by the TCP/IP stack in the Windows operating system. The default value is set to 2 hours (7,200,000) when keep-alive transmissions are enabled.

Determines whether the computer will release its NetBIOS name if requested by another computer or a malicious packet attempting to hijack the computer s NetBIOS name.

NoNameReleaseOnDemand PerformRouterDiscovery Determines whether the computer performs router discovery on this interface. Router discovery solicits router information from the network and adds the information retrieved to the route table. Setting this value to 0 will prevent the interface from performing router discovery.

Windows Task Manager is a Windows XP tool that enables you to start and stop tasks and processes. You can also get information about logged on users as well as gather some system and network performance statistics. To launch Windows Task Manager, press Ctrl+Alt+Del. If Use The Welcome Screen is enabled in User Accounts in Control Panel, Windows Task Manager will appear. If it s not enabled (or if you re connected to a domain), the Windows Security dialog box will appear, and you ll need to click its Task Manager button to open Windows Task Manager.

Table 19-4 lists the registry entries that you can make to harden the TCP/IP stack on your computers that run Windows Server 2003, Windows 2000, and Windows XP.

Table 19-4 Value EnableICMPRedirect SynAttackProtect TCPMaxConnectResponseRetransmissions TCPMaxHalfOpen TCPMaxHalfOpenRetired TCPMaxPortsExhausted TCPMaxDataRetransmissions EnableDeadGWDetect EnablePMTUDiscovery DisableIPSourceRouting KeepAliveTime NoNameReleaseOnDemand PerformRouterDiscovery

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Data (DWORD) 0 2 (1 in Windows Server 2003) 2 500 400 5 3 0 0 2 300,000 1 0

Additionally, you can secure the TCP/IP stack for Windows Sockets (Winsock) applications such as FTP servers and Web servers. The driver Afd.sys is responsible for connection attempts to Winsock applications. Afd.sys in Windows Server 2003, Windows 2000, and Windows XP supports large numbers of connections in the half-open state without denying access to legitimate clients. Afd.sys can use dynamic backlog, which is configurable, rather than a static backlog. You can configure four parameters for the dynamic backlog:

Part III: