DHCP SUBNET

[sis70777]

ADDING A SUBNET TO MY NETWORK ADAPTER
I CAN GET THE DHCP TO RUN BUT CAN NOT ADD A SUBNET TO POINT TO MY NETWORK CARD REALTEK8139 IS INSTALLED
USING LINUXCONFIG
DO I HAVE TO ADD ANOTHER HOST, ADAPTER
USING MANDRAKE 7.1

PLEASE ANY HELP

:confused: null[LIST]