About Ndis Intermedia Driver

Hi!
I have built a ndis intermedia driver(WIN2K) and it’s a filter
driver.
When i install this driver, it seems everything is ok (even i can find the
virtual adapter in the device manager and it’s list in the network control
panel also).But the network is blocked after i installed this driver.When i
run “ipconfig”,there is no message about ip adress ,network mask and
gateway returned.
Anyone knows the reasons?

Thanks
Regards