this may help quoted from
http://www25.brinkster.com/ChicagoTech
How to switch network settings without reboot
As a network consultant, I work on different network every day and need to
switch network settings such as IP and DNS accordingly. Fortunately, W2K/XP
comes with a useful tool, netsh.exe, that can switch network settings
quickly. To copy abc.com network settings, type command netsh -c interface
dump >c:\abc.txt. The abc.com network settings will be saved at the root of
the C drive. You can create as many network settings as I like. When you
work at abc.com next time, you will load the settings by typing netsh -f
abc.txt command and the abc.com network settings will take effect
immediately.
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For more and other information, go to
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Robert Lin, MS-MVP, MCSE & CNE
Windows & Network Support, Tips and FAQs on
http://www25.brinkster.com/ChicagoTech
This posting is provided "AS IS" with no warranties.