At the command line of your computer, enter the command ping localhost and write down the IP address that you see.
At the command line of your computer, enter the command hostname and write down the hostname that is returned. On Windows 95/98, the hostname does not work, but it is visible from WinIPCfg.
Enter a ping command followed by the hostname for your computer.
If you computer has a domain name, ping your FQDN.
Determine whether IP is configured to use a DNS server. If so, try the following pings:
Use NSLookup to connect to one of your ISP's DNS servers.