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For users on a host to access the Web through a proxy, they need to specify their proxy server in their Web browser configuration. For this you will need the IP address of the host running the Squid proxy server as well as the port it is using. Proxies usually make use of port 3128. To configure use of a proxy server running on the local sample network described in 7, you would enter the following. The proxy server is running on turtle.mytrek.com (192.168.0.1) and using port 3128.
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192.168.0.1 3128
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On Mozilla and Netscape, the user on the sample local network would first select the Proxy panel located in Preferences under the Edit menu. Then, in the Manual proxy configuration's View panel, enter the previous information. You will see entries for FTP, Gopher, HTTP, Security, and WAIS proxies. For standard Web access, enter the IP address in the FTP, Gopher, and Web boxes. For their port boxes, enter 3128. For Konqueror on the KDE Desktop, select the Proxies panel on the Settings window. Here, you can enter the proxy server address and port numbers. If your local host is using Internet Explorer (such as a Windows system does), you would set the proxy entries in the Local Area Network settings accessible from the Internet Options window. On Linux or Unix systems, local hosts can set the http_proxy, gopher_proxy, and ftp_proxy shell variables to configure access by Linux-supported Web browsers such as lynx. You can place these definitions in your .bash_profile or /etc/profile files to have them automatically defined whenever you log in.
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http_proxy=192.168.0.1:3128 ftp proxy=192.168.0.1:3128
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gopher_proxy=192.168.0.1:3128 export http_proxy ftp_proxy gopher_proxy
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Before a client on a local host could use the proxy server, access permission would have to be given to them in the server's squid.conf file, described in the following section on security. Access can be provided to an entire network easily. For the sample network used here, you would have to place the following entries in the squid.conf file. These are explained in detail in the following sections.
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acl mylan src 192.168.0.0/255.255.255.0 http_access allow mylan
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Tip Web clients that need to access your Squid server will need to know the server's address and the port for Squid's HTTP services, by default 3128.
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squid.conf
The Squid configuration file is squid.conf, located in the /etc/squid directory. In the /etc/squid/squid.conf file, you set general options like ports used, security options controlling access to the server, and cache options for configuring caching operations. You can use a backup version called /etc/squid/squid.conf.default to restore your original defaults. The default version of squid.conf provided with Squid software includes detailed explanations of all standard entries, along with commented default entries. Entries consist of tags that specify different attributes. For example, maximum_object_size and maximum_object set limits on objects transferred.
maximum_object_size 4096 KB
As a proxy, squid will use certain ports for specific services, such as port 3128 for HTTP services like Web browsers. Default port numbers are already set for squid. Should you need to use other ports, you can set them in the /etc/squid/squid.conf file. The following entry shows how you would set the Web browser port:
http_port 3128
Note Squid uses the Simple Network Management Protocol (SNMP) to provide status information and statistics to SNMP agents managing your network. You can control SNMP with the snmp access and port configurations in the squid.conf file.
Security
Squid can use its role as an intermediary between Web clients and a Web server to implement access controls, determining who can access the Web server and how. Squid does this by checking access control lists (ACLs) of hosts and domains that have had controls placed on them. When it finds a Web client from one of those hosts attempting to connect to the Web server, it executes the control. Squid supports a number of controls with which it can deny or allow access to the Web server by the remote host's Web client (see Table 27-3). In effect, Squid sets up a firewall just for the Web server. Table 27-3: Squid ACL Options Description Client's IP address
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