Single Adapter – Multiple IP Address

I am trying to bind multiple IP Address onto a single adapter on a laptop PCMCIA card, I have edited the registry and bind the IP in the registry and the multiple gateway, also I have included “DeadGateway=1” in the necessary location of the registry. However the laptop doesn’t seems to be searching for alternative gateway, when the default gateway is not available. I have tried the same steps on a desktop and it works fine. Could the problem be isolated to laptops or particular PCMCIA cards.