弄好了，由于publib和private的绑定顺序。
To ensure that your public interface is first in the bind order, follow these steps:
1.
Right-click My Network Places and choose Properties.
2.
In the Advanced menu, click Advanced Settings...
3.
If the public interface name is not the first name listed under the Adapters and Bindings tab, then select it and click the arrow to move it to the top of list
4.
Click OK to save the setting and then exit network setup dialog
