HOWTO: Log Client IP AND X-Forwarded-For IP in Apache - Techstacks HOWTO's
1 LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
2 LogFormat "%{X-Forwarded-For}i %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" proxy
3 SetEnvIf X-Forwarded-For "^.*\..*\..*\..*" forwarded
4 CustomLog "logs/access_log" combined env=!forwarded
5 CustomLog "logs/access_log" proxy env=forwarded