Forwarding TCP from IP

Hi there.
I really hope i am in the right place.
I need a service that can take ingoing trafic on one port (like 5000) on one IP from Nginx, then forward this trafic to Port 6000 on an IP of my choice, is that possible with Nginx, and what would that cost me?
The trafic is no more than 1-2 GB per month.

I really hope you can help me.

Thanx