Squid Proxy Hide System’s Real IP Address

My squid proxy server is displaying system's real IP address. I've a corporate password protected squid proxy server located at 202.54.1.2. My clients works from home or offices via A/DSL / cable connections. Squid should hide all system's IP address, but it is forwarding and displaying the system's IP address. How do I configure squid to hide client's real IP address?

Squid proxy server has directive called forwarded_for. If set, Squid will include your system's IP address or name n the HTTP requests it forwards. By default it looks like
this:
X-Forwarded-For: 191.1.2.5
If you disable this, it will appear as
X-Forwarded-For: unknown
Open squid.conf file:
# vi squid.conf
Set forwarded_for to off:
forwarded_for off
Save and close the file. Restart squid server:
# /etc/init.d/squid restart