If you experience a network connection problem. Here are some of the most useful network troubleshooting commands. Just type the command in a Command Prompt Window (CMD.EXE).
# ipconfig /all [ Display full Information about Network configuration]
# ipconfig /displaydns [ Displays the contents of the DNS client resolver cache ]
# ipconfig /flushdns [ Clear the local dns cache.]
# ipconfig /registerdns [ Is used for manual dynamic registration for the DNS names and IP addresses that are configured at a computer.]
# ipconfig /release [ Sends a DHCP release message to the DHCP server to release the current DHCP configuration and discard the IP address configuration for all network adapters.]
# ipconfig /renew [ Renews DHCP configuration for all network adaptors. *It does not clear the client resolver cache on client computers.]
Another excellent command is Netsh – Netsh.exe is a command-line scripting utility that allows you to, either locally or remotely, display or modify the network configuration of a computer that is currently running.
# netsh interface ip set dns [ is used to configure the source of DNS server addresses, set a DNS server address, and manage DNS registration behavior. And not to clear client resolver caches.]
# netsh interface ip set address “Local Area Connection” dhcp [ Typing this command changes the interface named “Local Area Connection” to DHCP configuration.]
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And others such as Ping,Tracert and NSLookup Commands.
Applies to Windows 2000 & XP