I have a mikrotik os with 2 interface one internal and another external. i was d/s nat them. now i want to route a valid address from my external interface to my internal interface.
is it possible?
Either you configure this routing on your gateway (ISP router), or use NAT:
http://www.mikrotik.com/testdocs/ros/2.9/ip/nat_content.php#6.36.3.4