Public address passthrough

I have a server with public address on the nic 70.x.x.38 my Router has 70.x.x.34/28 assigned to eth1 10.0.0.1\16 to eth2, eth3 is connected directly to the server. how to i get all traffic to go from 70.x.x.38 on eth1 to the server connected on eth 3.

I have nat setup the public addresses that are pointed to internal network servers, but I need the router to point to a public network address on the server.

Not sure if this is a big deal or not but any help would be appreciated.

You can use NAT to achieve it either on a port by port basis or for all ports (just translate the IP). If the server already routes out via the router NAT is all that you should need.