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Troubleshoot DNS with ipconfig in Windows 2000

The console-based ipconfig command enables you to view and set IP settings for the local computer; it also allows you to view DNS information and troubleshoot DNS problems. This Windows 2000 Pro tip explains which ipconfig commands to use to troubleshoot DNS problems.

The console-based ipconfig command enables you to view and set IP settings for the local computer. For example, the follow command lists all settings and properties for IP:

ipconfig /all

However, configuring IP settings isn't the only task you can perform with ipconfig. This handy tool also lets you view DNS information and troubleshoot DNS problems.

For example, if a DNS lookup has failed because a DNS server wasn't available, that failed lookup is cached by the computer. You can clear the local DNS resolver cache with the following command:

ipconfig /flushdns

When you're troubleshooting DNS, it's sometimes useful to be able to view the contents of the resolver cache to determine what the resolver has returned for a particular host. To view the cache, use the following command:

ipconfig /displaydns

In addition, you can also cause Windows to update the DNS record for the local host in the local DNS server:

ipconfig /registerdns

Updating the host record in DNS ensures that the host name will resolve to the appropriate IP address after a DHCP lease renewal or manual address change.

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