Multiple IP's assigned to a network card in Windows Vista

Hi, I have a network card with a static IP configuration. I have assigned 10
ip addresses (xxx.xxx.145.200, xxx.xxx.145.201,,,,,,,, xxx.xxx.145.209). I
want to assign one of them how a local gateway, and I don't konw how to make
it. I always use with a local gateway the lower IP address. If I change the
order in a interface configuration It happens the same.

Example:
x.x.145.201, x.x.145.202,......, x.x.145,200 The local gateway is x.x.145.200
x.x.145.202, x.x.145.201,......, x.x.145,200 The same
,
,
,
Always the same. With Windows XP the first IP address was the defautl gateway.

Please Help me.