After Install and default setting, you might want to enable password based proxy change following lines.
Following line will enable .htaccess based password auth.
auth_param basic program /usr/local/libexec/squid/ncsa_auth /usr/local/etc/squid/passwd
Add following line if not exists.
acl all src all
Above line should be above following lines.
acl manager proto cache_object acl localhost src 127.0.0.1/32 acl to_localhost dst 127.0.0.0/8
Define authentication method for user.
acl ketan proxy_auth ketan </bash> Allow user to access proxy. <code bash> http_access allow ketan
In order to define IP based on authenticated user.
Add following line. (considering you all of the above already exists)
tcp_outgoing_address 188.8.131.52 ketan