dvb downlink and mikrotik

Hi , i have an upload link and a downlink , my real ip is on the windows system where the security is not present i want to forward all packets coming from the dvb to the mikrotik on a fake ip on the ether1 for exaple all packets coming from sat will arive to the default gateway 10.0.0.1 and on the ether2 on mikrotik will be my real ip 82.198 how i can forward inside the mikrotik the packets from ether1 to ether2 ? and my upload link will be on ether3 , i will do rip between ether2 and ether3 to make all work