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Use The Alternate IP Configuration Feature
If you routinely move your laptop between two locations, you should know about Windows XP's alternate IP configuration feature. If one location (your office, for example) requires a fixed IP address configuration, you can specify the office IP address, gateway address, and DNS server address information in the Alternate Configuration tab of the TCP/IP Properties page.
When your computer starts, it automatically attempts to obtain an address from a DHCP server. If no DHCP server is found, Windows uses the alternate IP address information. If a DHCP server is found (as would happen on a home LAN with an Internet gateway device), the system uses the DHCP-provided address instead.
source: from a pc mag
If you routinely move your laptop between two locations, you should know about Windows XP's alternate IP configuration feature. If one location (your office, for example) requires a fixed IP address configuration, you can specify the office IP address, gateway address, and DNS server address information in the Alternate Configuration tab of the TCP/IP Properties page.
When your computer starts, it automatically attempts to obtain an address from a DHCP server. If no DHCP server is found, Windows uses the alternate IP address information. If a DHCP server is found (as would happen on a home LAN with an Internet gateway device), the system uses the DHCP-provided address instead.
source: from a pc mag