CreateIpForwardEntry函数在VIsta/win2008下需要注意的一个地方

On Windows Vista and Windows Server 2008, the route metric specified in the dwForwardMetric1 member of the MIB_IPFORWARDROW structure pointed to by pRoute parameter represents a combination of the route metric added to the interface metric specified in the Metric member of the MIB_IPINTERFACE_ROW structure of the associated interface. So the dwForwardMetric1 member of the MIB_IPFORWARDROW structure should be equal to or greater than Metric member of the associated MIB_IPINTERFACE_ROW structure. If an application would like to set the route metric to 0, then the dwForwardMetric1 member of the MIB_IPFORWARDROW structure should be set equal to the value of the interface metric specified in the Metric member of the associated MIB_IPINTERFACE_ROW structure. An application can retrieve the interface metric by calling the GetIpInterfaceEntry function.

很多人没有注意MSDN中专门强调的这段话。