Ubuntu as Internet Gateway

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http://askubuntu.com – I am trying to build a Computer to act as a internet gateway I installed Ubuntu desktop with two NIC cards installed. The eth0 is connected to the internet from my modem with static ip address 203.2xx.xxx.xxx netmask 255.255.255.xxx gateway 203.2xx.xxx.xxx and dns 203.xxx.xxx.xx the other one eth1 is connected to a switch with ip address gateway how can i share internet to other users without using dhcp I want to manually place static ip address to client computers for example client 1 is and so on I can connect via local network but not the internet please help me (HowTos)