1.iphelper api
http://search.csdn.net/Expert/topic/690/690004.xml?temp=.4777185
2.
wmi
EnableStatic Method in Class Win32_NetworkAdapterConfiguration
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/enablestatic_method_in_class_win32_networkadapterconfiguration.asp
3.netsh