Quick Squid proxy installation on Cent OS

       yum -y install squid
       chkconfig squid on

to start
       service squid start

to Stop
       service squid stop

to restart
       service squid restart

To allow only selected IPs, just add an entry in
       vim /etc/squid/squid.conf
just before
       acl SSL_ports port 443
#adding custom entries
       acl localnet src 146.531.2484.1234

and then restart