Apache/Akamai, and True-Client-IP

You’re running a site behind Akamai, but can’t see the real client’s IP address, only that of your load balancer and/or Akamai’s IP addresses. Therefore you can’t act on it, ban IP’s….etc.
Akamai does pass the true IP address of clients, but not through the standard X-Forwarded-For header. It uses one named True-Client-IP. Apache doesn’t understand True-Client-IP so it doesn’t pass this along internally to logging and other modules like PHP.
There exists an Apache module named mod_remoteip which was introduced in Apache 2.4. A lot of sites don’t run Apache 2.4 yet as of the time of this article, but you can get a backported mod_remoteip module [link] thanks to Brane F Gracnar which runs with Apache 2.2. This module will take the value of True-Client-IP (or any other custom header) and overwrite REMOTE_ADDR internally, thereby allowing Apache to work with the real IP address of the client.
You can compile and install the module with
apxs -i -a -c mod_remoteip.c
After that, put this into your Apache vhost
RemoteIPHeader True-Client-IP
That’s all there is to it! The real clients IP address will now show in logs and in Apache server-status.

You need verify the apache version installed

apachectl -V

After, install

apt-get install apache2-dev
And 
wget https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/metadata/mod_remoteip.c

And compile/install

apxs -i -a -c mod_remoteip.c

Edit the apache host

RemoteIPHeader True-Client-IP

And restart service apache

/etc/init.d/apache2 restart
https://syslint.com/blog/tutorial/replacing-mod_rpaf-with-mod_remoteip-in-apache-2-4-nginx-real_ip-problem-solution/
https://www.coredump.id.au/apache-akamai-and-true-client-ip/
https://community.akamai.com/videos/1232