forward an request to IP:port ?

Hi guys... I need to forward a request coming to one IP at an specific port (example 10.10.10.1:443) to another IP at another specific port (example 196.40.46.9:80) Eth1 / 196.40.1.1:443 -----> Eth1 / 10.10.10.1:443 Thanks :) bye --ed