How to forward ports in ubuntu server?

Question

ubuntu

There is a server with a white address 1.2.3.4 and there is a server with an internal address 5.6.7.8, and so the problem is, you need to redirect port 8888 from white to internal.
How to do it?

Answer 1

Usually something like this is done on routers:

iptables -A PREROUTING -t nat -d 1.2.3.4 -p tcp -m tcp --dport 8888 -j DNAT --to-destination 5.6.7.8:8888