Fedora NAT-ing

[Generator]

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I have a internet connection with static IP address.
I have created a LAN, all network machines can connect to internet.

ICS machine ip configuration:
ip:172.16.103.XXX
DNS server:172.16.103.XX

Network machine ip configuration:-
ip:192.168.1.2
subnet mask:255.255.255.0
gateway:192.168.1.1
DNS server:172.16.103.XX

now every computer in my local network is broadcasting my static ip address that is 172.16.103.XXX
I obviously do not want that. I want each computer on my local network go to the internet with their own ip (like 202.78.233.154). Please help.

I have set a nating rule with fwbuilder.
it is -
$IPTABLES -t nat -A POSTROUTING -o em1 -s 192.168.1.0/24 -j SNAT --to-source 172.16.103.XXX

but no effect.
Please help.

[rcgreen]

With NAT, any computer on your network will appear on the net with the public address of the NAT machine.
For each to go on the net with its own address, you would need to purchase more addresses from your
provider, and you would not need NAT.