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/Users/~/Library/Preferences/com.apple.NetworkUtility.plist

/Users/~/Library/Preferences/com.apple.internetconfig.plist
and several more with "internet" in them.

But it is easy enough to take screen shots of your setup in System Preferences >> Network and then reset them without dragging around old prefs.

Unless you are planning to erase & install, they will be preserved with the other 2 options.

-mj
 
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