The http_port directive tells Squid which port number to listen on for HTTP requests. The default is port 3128:
If you are running Squid as a surrogate (see Chapter 15), you should probably set this to 80.
You can instruct Squid to listen on multiple ports with additional http_port lines. This is often useful if you must support groups of clients that have been configured differently. For example, the browsers from one department may be sending requests to port 3128, while another department uses port 8080. Simply list both port numbers as follows:
http_port 3128 http_port 8080
You can also use the http_port directive to make Squid listen on specific interface addresses. When Squid is used on a firewall, it should have two network interfaces: one internal and one external. You probably don't want to accept HTTP requests coming from the external side. To make Squid listen on only the internal interface, simply put the IP address in front of the port number: