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2. Double-click the icon for the connection about which you want more information. (Alternatively, you can select the icon and click View Status Of This Connection in the command bar.)
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3. Click Details to see the currently assigned IP address, subnet mask, and default gateway for that connection. (If you have IPv4 and IPv6 connectivity, the Network Connection Details dialog box shows information for both.) In the following example, you can tell that the IP address was automatically assigned by the DHCP server in a router; details indicate that DHCP is enabled, and DHCP server address matches that of the router.
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You can also get details of your IP configuration by using the IP Configuration utility, Ipconfig.exe, in a Command Prompt window. Used without any parameters, typing ipconfig at a command prompt displays the DNS suffi x, IPv6 and/or IPv4 address, subnet mask, and default gateway for each network connection. To see exhaustive details about every available network connection, enter ipconfig /all.
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To see a full list of options for the Ipconfig command, use the / switch .
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The actual IP address you see may help you solve connection problems:
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If the address is in the format 169.254.x.y, your computer is using Automatic Private IP Addressing (APIPA). This means your computer s DHCP client was unable to reach a DHCP server to be assigned an IP address. Check the connection to your network. If the address is in one of the blocks of IP addresses reserved for use on private networks (for details, see Setting IP Addresses, 12), make sure that another computer (an Internet Connection Sharing host) or a router or residential gateway is routing your internet requests to a properly configured public IP address. If the address of your computer appears as 0.0.0.0, the network is either disconnected or the static IP address for the connection duplicates an address that already exists on the network. Make sure you re using the correct subnet mask for computers on your local network. Compare IP settings on the machine that s having problems with those on
Troubleshooting TCP/IP Problems
Note
Are you baffled by subnets and other related technical terms For an excellent overview of these sometimes confusing topics, read Knowledge Base article 164015, Understanding TCP/IP Addressing and Subnetting Basics (http://www.vista-io.com/1403), which of(http://www.vista-io.com/1403), fers information about IPv4 . For comparable details about IPv6, see the Introduction to IPv6 white paper at TechNet (http://www.vista-io.com/1404) . (http://www.vista-io.com/1404) .
Repairing Your TCP/IP Configuration
If you suspect a problem with your TCP/IP configuration, try either of the following repair options:
Use the automated repair option. Right-click the connection icon in Network Connections and click Diagnose. Renew your IP address. Use the ipconfig /renew command to renew your IPv4 address from the DHCP server; use ipconfig /renew6 to renew the IPv6 address.
Resolving DNS Issues
The Domain Name System (DNS) is a crucial part of the internet. DNS servers translate host names (http://www.microsoft.com, for instance) into numeric IP addresses, so that packets can be routed properly over the internet. If you can use the Ping command to reach a numeric address outside your network but are unable to browse websites by name, the problem is almost certainly related to your DNS configuration. Here are some questions to ask when you suspect DNS problems:
Do your TCP/IP settings point to the right DNS servers Inspect the details of your IP configuration and compare the DNS servers listed there with those recommended by your internet service provider. (You may need to call your ISP to get these details.)
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other computers on the network. The default gateway and subnet mask should be identical for all network computers. The first one, two, or three sets of numbers in the IP address for each machine should also be identical, depending on the subnet mask. A subnet mask of 255.255.255.0 means the first three IP address numbers of computers on your network must be identical 192.168.0.83 and 192.168.0.223, for instance, can communicate on a network using this subnet mask, but 192.168.1.101 will not be recognized as belonging to the network. Likewise, with a subnet mask of 255.255.0.0, the first two numbers in each address must match 172.16.2.34, 172.16.4.56, and 172.16.83.201 are all valid addresses on a subnet with this mask. In every case, the gateway machine must also be a member of the same subnet. (If you use a router, switch, or residential gateway for internet access, the local address on that device must be part of the same subnet as the machines on your network.)
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