Squid - Proxy Server

Squid is a full-featured web proxy cache server application which provides proxy and cache services for Hyper Text Transport Protocol (HTTP), File Transfer Protocol (FTP), and other popular network protocols. Squid can implement caching and proxying of Secure Sockets Layer (SSL) requests and caching of Domain Name Server (DNS) lookups, and perform transparent caching. Squid also supports a wide variety of caching protocols, such as Internet Cache Protocol, (ICP) the Hyper Text Caching Protocol, (HTCP) the Cache Array Routing Protocol (CARP), and the Web Cache Coordination Protocol. (WCCP)

The Squid proxy cache server is an excellent solution to a variety of proxy and caching server needs, and scales from the branch office to enterprise level networks while providing extensive, granular access control mechanisms and monitoring of critical parameters via the Simple Network Management Protocol (SNMP). When selecting a computer system for use as a dedicated Squid proxy, or caching servers, ensure your system is configured with a large amount of physical memory, as Squid maintains an in-memory cache for increased performance.

Squid uses the configuration file squid.conf. It is usually located in the /etc/squid directory. Access through the proxy can be given by individual IP addresses or by a subnet of IP addresses.
In squid.conf search for the default access control lists(acl) and add the following line below them:

acl mynetwork src 192.168.1.0/255.255.255.0 (for subnet)
acl mynetwork src 192.168.1.10/255.255.255.0 (for individual IP)

Then add the access control list named "mynetwork" to the http_access list with the following line:

http_access allow mynetwork

The default port for the proxy is 3128. Uncomment the following line and replace 3128 with the desired port :

http_port 3128