[LARTC] Internet Satellite connection configuration on linux

[Rani Ahmed]

hi all. here in Lebanon,Beriut we are allowed only to use satellite for 
downlink only. uplink is made through a router connected to public land 
lines. The satellite card is a penta card. i want to distribute Internet 
connection to customers.

such a connection i want to do on linux. but what hinders me is the 
configuration which i dont know how to do.
so please , some one tell me how to configure that, please.

this is the diagram of what  i want to make with linux:
 
      ----satelite----downlink_only----->[Linux box]<---->{customers_LAN}
                                                          ||
                                                          ||
   {ISP} <====(cisco_router)<==uplink=
                                             
Thanks for you help.