13-13Lesson 1 Configuring and Troubleshooting TCP/IP
When you use the Ping command, you ping from the inside out. You want to find out
where the communication and connection fail. For example, you ping the loopback
address first, then a local computer on the same network, then a DNS or DHCP server
on the local subnet if one exists, then the default gateway, then a remote computer on
another network, and finally a resource on the Internet. You should be able to find out
where the breakdown occurs by compiling the results of these checks.
Note When using the Ping command, you can use either the computer name or the com-puter’s IP address.Pinging the Loopback Address The loopback address (127.0.0.1) is the first thing
you should check when a TCP/IP problem appears. If this check fails, the TCP/IP con-
figuration for the local machine is not correct. To ping the loopback address, follow
these steps:
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