rpaf

mod_rpaf is an apache module that translate proxy IP to real IP when apache web server is behind a proxy server.

https://github.com/gnif/mod_rpaf/

To install on Ubuntu, run

apt install -y libapache2-mod-rpaf

Config file available at

root@vps528168:~# cat /etc/apache2/mods-enabled/rpaf.conf
    RPAFenable On

    # When enabled, take the incoming X-Host header and
    # update the virtualhost settings accordingly:
    RPAFsethostname On

    # Define which IP's are your frontend proxies that sends
    # the correct X-Forwarded-For headers:
    RPAFproxy_ips 127.0.0.1 ::1 193.70.86.5

    # Change the header name to parse from the default
    # X-Forwarded-For to something of your choice:
    RPAFheader X-Real-IP
root@vps528168:~# 

Apache