CLICK OK IN THE PROPERTIES DIALOG BOX AND OK IN THE CONNECTION’S PR...

3. Click OK in the Properties dialog box and OK in the connection’s Properties dia-

log box. Reboot the computer if prompted.

Pinging Other Resources To ping any other computer on the network, simply replace

the loopback address with the TCP/IP address of the resource on the network. Ping a

local computer on the same subnet first, and then ping the gateway address. If you can

ping the loopback address (a local computer on the same subnet), but the Ping com-

mand to the gateway fails, you probably found the problem. In this case, check the

configuration on the local computer for the gateway address and verify that the gate-

way (or router) is operational.

If the ping to the gateway address is successful, continue to ping outward until you

find the problem. For instance, ping a computer on a remote subnet and verify that the

DNS server is operational.

Note Although pinging remote computers is a useful troubleshooting technique, many hosts and routers filter out incoming Internet Control Message Protocol (ICMP) echo requests (which are the basis of ping). Such hosts do not respond to a ping request, making it appear that the host cannot be reached. By default, computers protected with Windows Firewall also filter out such requests to protect the computers from intruders that would use ICMP-based denial of service (DoS) attacks or use ICMP to map a remote network.

Using Ipconfig

You can use the Ipconfig command-line utility to view current TCP/IP configuration

information for a computer. To use Ipconfig, open the command prompt window and

type Ipconfig to view basic TCP/IP parameters, Ipconfig /all to view the complete

TCP/IP configuration (as shown in Figure 13-7), or Ipconfig /? to view additional

options.