Using both DHCP and a fixed IP simultaneously
Using the Alternate Configuration providing by Windows Vista, you can set both automatic and fixed IP addresses and then you can select to use either of them to connect to the Internet.
1Click Start > Control Panel > Network and Internet > Network and Sharing Center and click Manage Network Connections in the left pane.
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3Select Internet Protocol Version 4 (TCP/IPv4) from the Networking tab and select Properties.
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Select the Alternate Configuration tab, select User configured and fill in the corresponding fields.
When you have completed the settings, click the OK button.
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