ADSL + NAT

[edwardspl at ita.org.mo]

Dear All,

Now, there is a Server machine installed with FC6 System and two of LAN 
cards, so I want to setup a boardband share machine as the following 
function :
1, The eth0 ( ifcfg-eth0 connect with ADSL cable ), and the eth1 ( 
ifcfg-eth1 connect with Client via HUB, means NAT, then all of client 
connect to internet also )
2, All of the client / server machine connct to the Intermet via the 
ADSL by auto ( if there is no internet singal, then the ADSL will be 
disconnected after 30 mins )

So, is there any solution for these setup ?
1, profile of ifcfg-eth0 and ifcfg-eth1.
2, ADLS program setup

Many thank for your help !

Edward.