Recently I started using Pound as a load balancer to a cluster of nginx servers and found my access logs were filled with the IP address of the load balancer. I did some digging and found the correct way to “fix” this.
First thing you need to do is make sure you remove X-Forwarded-For from Pound
ListenHTTP # ... snip ... # ... snip ... HeadRemove "X-Forwarded-For" End
Once this is done, reload Pound.
Next you need nginx compiled with realip module - http://wiki.nginx.org/NginxHttpRealIpModule
On Ubuntu/Debian servers this module comes by default, otherwise you may have to compile it in yourself using the following option:
Once this is all done modify your nginx vhosts and add the following 2 lines
set_real_ip_from [IP]; real_ip_header X-Forwarded-For;
Where [IP] is the IP address of your load balancer.
To configure this to work with Apache you need the mod_rpaf module.