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Windows Vista Security: Praxisorientierte Sicherheit für Profis by Marcus Nasarek

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Chapter 14: Setting Up Your Network
your network adapters are integrated into the motherboard, you must flash the BIOS
to update the firmware associated with the adapters and update the driver for the
operating system.
If you still cannot connect to the network, check your TCP/IP configuration settings,
as discussed previously in the “Configuring the IPv4 and IPv6 Protocols” section of
this chapter. You can also use the techniques discussed in the upcoming “Using the
Command Line to Diagnose Network Problems and “Fixing Network Problems” sec-
tions to help you with troubleshooting configuration issues. If none of these efforts
resolves the problem, try replacing the network adapter with a second network
adapter. This should verify connectivity problems or resolve the issue. If the prob-
lem follows the adapter, you can assume the adapter has a problem. If you still can-
not connect to the network with a new adapter, verify that the slot in the
motherboard works correctly. If your network adapters are integrated into the moth-
erboard, you can still add a different physical network adapter into a slot on the
motherboard. You may then want to disable the integrated adapters in the BIOS to
avoid IRQ conflicts on your computer.
To check the functionality of the slot in the motherboard, install the network adapter
into a different slot on the motherboard. If you still cannot connect to the network or
see an adapter, you should update the BIOS on your motherboard or contact the
manufacturer’s technical support to either identify the problem with the board or get
a replacement board, assuming you have warranty support on the board in question.
Once you have the replacement board, you can connect the network adapter to ver-
ify connectivity.
Using the Command Line to Diagnose Network Problems
Microsoft offers many different tools to help diagnose network problems. The best
tools for testing your network are those available at the command line. For trouble-
shooting, be sure to start the command line with elevated privileges by completing
the following steps:
1. Click Start, click All Programs, and then click Accessories.
2. Right-click Command Prompt and then select “Run as administrator.”
3. This opens an administrator command prompt that you can use to perform any
necessary troubleshooting procedures.
To begin troubleshooting, you should first determine the IP configuration for all net-
work adapters on your computer. To accomplish this task, type
IPconfig /all at the
command prompt you opened previously. You will see the output of the TCP/IP
stack concerning the characteristics of your local machine, similar to Example 14-1,
which gives you a great view of the properties controlling access to your network and
its resources. You can see immediately the name of the host, type of connection,
routing capability, DNS name, MAC address, IP address, DHCP server IP address,
subnet, default gateway, and IP address for each adapter connected to the computer.

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