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File And Printer Sharing For Microsoft Networks By default, File And Printer Sharing For Microsoft Networks is bound on all network interfaces. The File And Printer Sharing For Microsoft Networks component enables other computers on a network to access resources on your computer. By removing the binding to File And Printer Sharing For Microsoft Networks from a network interface, you can prevent other computers from enumerating or connecting to files and printers that have been shared through that network interface. Stopping the Server service will also prevent a computer from hosting file or print shares. After removing this binding from a network interface, the computer will no longer listen for server Message Block (SMB) connections on TCP port 139 of that interface but will still listen on port 445 for other SMB packets. Direct hosted NetBIOS-less SMB traffic uses port 445 (TCP and UDP). Removing this setting will not interfere with the computer s ability to connect to other shared files or printers. You can unbind File And Printer Sharing For Microsoft Networks in the Network And Dial-Up Connections Control Panel or on the Properties page of the network interface. You can prevent Windows from listening for direct SMB traffic by deleting the default value from the registry entry HKLM\System\CurrentControlSet\Services\NetBT\Parameters\TransportBindName. A host-based firewall, such as Windows Firewall in Windows XP and Windows Server 2003, is also an effective option for preventing other computers from connecting to SMB ports.

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Keep in mind that performance monitoring is not the same as troubleshooting network connectivity between hosts on your network or on the Internet. You can learn more about troubleshooting connectivity in 12, Solving Connectivity Problems.

NetBIOS Over TCP/IP Windows Server 2003, Windows 2000, and Windows XP support file and printer sharing traffic by using the SMB protocol directly hosted on TCP. This differs from earlier operating systems, in which SMB traffic requires the NetBIOS over TCP/IP (NetBT) protocol to work on a TCP/IP transport. If both the direct-hosted and NetBT interfaces are enabled, both methods are tried at the same time and the first to respond is used. This allows the Windows operating system to function properly with operating systems that do not support direct hosting of SMB traffic. NetBIOS over TCP/IP traditionally uses the following ports: NetBIOS name NetBIOS name NetBIOS datagram NetBIOS session 137/UDP 137/TCP 138/UDP 139/TCP

Direct-hosted NetBIOS-less SMB traffic uses port 445 (TCP and UDP). If you disable NetBIOS over TCP/IP (NetBT) and unbind File And Printer Sharing For Microsoft Networks, the computer will no longer respond to any NetBIOS requests. Applications and services that depend on NetBT will no longer function once NetBT is disabled. Therefore, verify that your clients and applications no longer need NetBT support before you disable it.

DNS Registration By default, computers running Windows Server 2003, Windows 2000, and Windows XP attempt to register their host names and IP address mappings automatically in the Domain Name System (DNS) for each adapter. If your computer is using a public DNS server or cannot reach the DNS server, as is often seen when the computer resides in a screened subnet, you should remove this behavior on each adapter.

A bottleneck is a process, device, or other entity that is responsible for reducing performance. For example, if a computer s network adapter has a hardware fault that causes it to process data slowly, and that computer receives hundreds of requests from network clients every minute, that network adapter will act as a bottleneck on the computer s ability to serve data because the computer will have to wait for the adapter to service requests. Any computer component, service, or network component can become a bottleneck. In small networks, locating bottlenecks is often easy. In large networks, detection often becomes far more complex.

Denial-of-service attacks are network attacks aimed at making a computer or a particular service on a computer unavailable to network users. Denial-of-service attacks can be difficult to defend against. To help prevent denial-of-service attacks, you can harden the TCP/IP protocol stack on computers that run Windows Server 2003, Windows 2000, and Windows XP. You should harden the TCP/IP stack against denial-of-service attacks, even on internal networks, to prevent denial-of-service attacks that originate from inside the network as well as on computers attached to public networks. You can harden the TCP/IP stack by customizing these registry values, which are stored in the registry key HKLM\SYSTEM\CurrentControlSet\ Services\Tcpip\Parameters\:

EnableICMPRedirect When ICMP redirects are disabled (by setting the value to 0), attackers cannot carry out attacks that require a host to redirect the ICMP-based attack to a third party.

Microsoft Visual C# 2008 Express Edition: Build a Program Now!

Part III:

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