How to make a proxy while transferring the server to another IP address?

Question

proxy

It is necessary to move the server to another IP, but until everything settles down, it is necessary that it be available at the old IP address too. It will take several days for all those who work with this server to update their IPTABLES.

It is necessary that all requests from the old IP are forwarded to the new one.

How can this issue be resolved? For example, if you put a proxy on an old virtual machine, then what should you set to work out of the box with a minimum of settings?

Answer 1

If http/https, then nginx is in reverse proxy mode
If you want to control specific ports, something like: iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to-destination 192.168.1.2
In fact, you just forward the old port to the new IP.