can't set the ip address on a atm NIC

Hi all:
I have write a atm usb NIC, that means the atm NIC use the usb interface.
After I installed it, I can set the ip addrss about this atm NIC, but when I use ipconfig/all in command line, it shows that there no ip address at all. And when I ping myself with the ip address I just set, it say the host is unreachable. How can i solve it!

Thanks!!
Kamasamikon. Y
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