Howto: Configure client-ip reporting in Apache when running behind Varnish

When you install Varnish (cache server), all your websites will be served first by varnish. Apache logs will see client ip as 127.0.0.1.

Concerns:
Modules that depend on client ip / filtering breaks. eg. mod_spamhaus

Solution:
There is this module mod_extract_forwarded. This has been build for Apache 2.0 but it works for Apache 2.2.17 of CWP too.

Instructions:
http://share.ashokjp.com/linux/varnish-apache-and-client-ip-reporting-for-mod_spamhaus.html

I have compiled instructions to get this working on a CWP server. It works for me, still please try it at your own risk, make necessary backups before you try !!

Has anyone tried this method on Apache 2.2.31 with Varnish 3.xx or maybe even mod_rpaf ?