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Network Map is more than a pretty picture. If you hover the mouse pointer over a computer or other device, you get more information about the device, including information such as its IPv4 and IPv6 addresses and its MAC address. Network infrastructure devices (such as routers) that include Windows Rally support offer a menu of choices when you click them, usually including one that leads to the device s configuration page. For computers with shared resources, you can double-click them in Network Map to open them, just as you can in the Network folder. Network Map, like the mini-map in Network And Sharing Center, indicates broken network connections with an X. Click Diagnose And Repair to attempt a solution.
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TCP/IP is the default communications protocol of the internet; in Windows Vista it s installed and configured automatically and cannot be removed. Most of the time, your TCP/IP connection should just work, without requiring any manual configuration. When you encounter problems with TCP/IP-based networks, such as an inability to connect with other computers on the same network or difficulty connecting to external websites, the problems may be TCP/IP-related. You ll need at least a basic understanding of how this protocol works before you can figure out which tool to use to uncover the root of the problem.
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Anytime your network refuses to send and receive data properly, your first troubleshooting step should be to check for problems with the physical connection between the local computer and the rest of the network. Assuming your network connection uses the TCP/IP protocol, your most potent weapon is the Ping utility. When you use the Ping command with no parameters, Windows sends four echo datagrams, small Internet Control Message Protocol (ICMP) packets, to the address you specify. If the machine at the other end of the connection replies, you know that the network connection between the two points is alive.
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Where does the name Ping come from Some claim that it s short for Packet INternet Groper . However, the author of this utility, which was written for BSD UNIX in 1983, says it was originally named after the sound a submarine s sonar system makes when it sends out pulses looking for objects in the sea .
To use the Ping command, open a Command Prompt window (Cmd.exe) and type the command ping target_name (where target_name is an IP address or the name of another host machine). The return output looks something like this:
C:\>ping www.example.com Pinging www.example.com [192.0.34.166] with 32 bytes of data: Reply Reply Reply Reply from from from from 192.0.34.166: 192.0.34.166: 192.0.34.166: 192.0.34.166: bytes=32 bytes=32 bytes=32 bytes=32 time=31ms time=30ms time=30ms time=33ms TTL=48 TTL=48 TTL=48 TTL=48
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Ping statistics for 192.0.34.166: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 30ms, Maximum = 33ms, Average = 31ms
Note
The n switch is case-sensitive; don t capitalize it .
A high rate of timeouts, also known as packet loss, usually means problems elsewhere on the network and not on the local machine. (To see the full assortment of switches available for the Ping command, type ping with no target specified.) If every one of your packets returns with the message Request timed out, the problem may be the TCP/IP connection on your computer or a glitch with another computer on that network. To narrow down the problem, follow these steps, in order, stopping at any point where you encounter an error: 1. Ping your own machine using any of the following commands:
ping ::1 ping 127.0.0.1 ping localhost
This standard IP address corresponds to your computer. (The first is the IPv6 address for your own computer; the second is the IPv4 address.) If you receive an error, then TCP/IP is not configured properly on your system. For fi x-it details, see Repairing Your TCP/IP Configuration, in this chapter. 2. Ping your computer s IP address. 3. Ping the IP address of another computer on your network. 4. Ping the IP address of your router or the default gateway on your network. 5. Ping the address of each DNS server on your network. (If you don t know these addresses, see the next section for details on how to discover them.) 6. Ping a known host outside your network. Well-known, high-traffic websites are ideal for this step.
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