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The squid.conf file is a very large file with default settings commented in detail. An easy way to make your entries is to search for the corresponding localhost entries and add your network ones below them. The acl entry for localhost will begin with "acl localhost". The one for access will begin with "http_access allow localhost". Squid configuration is discussed in detail in 27. You can also use Linuxconf or Webmin to configure Squid. Once it is configured, you can run Squid with the service command.
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service squid start
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Use chkconfig to have it start automatically when you boot.
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When configuring a Web browser, select the Proxy option and enter for the proxy server, the IP address of the gateway running Squid and port 3128. On Netscape select the Proxy entry under Advanced in the Options panel, and then view the manual proxy connections. For example, using the sample network described in this chapter, the Squid proxy server would be running on 192.168.0.1 and use port 3128. So the entry used in Web browsers would be the following for the different servers:
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And then use 3128 for the port:
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Now any user on your network with a correctly configured browser can access the Web.
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Now that your local network is physically set up, your Red Hat gateway/server needs to run certain services to allow your hosts to communicate over the network. You first have to configure and run a Domain Name Service (DNS), which will allow all the hosts on your local network to identify each other using a hostname. This involves several steps: 1. Decide on the IP addresses to assign to each local host. Use 192.168.1 as the network address. 2. Decide on the domain name for your local network. 3. Decide on the hostname for each host on your network. 4. Each host has to be configured with its IP address and domain name address. 5. On the Red Hat gateway/server, configure a DNS server listing each host's IP address and hostname. 6. Start the DNS service. All hosts on the Internet are identified by their IP addresses. When you send a message to a host on the Internet, you must provide its IP address. Using a sequence of four numbers of an IP address, however, can be difficult. They are hard to remember, and it's easy to make mistakes when typing them. To make identifying a computer on the Internet easier, the Domain Name Service (DNS) was implemented. The DNS establishes a fully qualified domain name address for each IP address. The fully qualified domain name consists of the name of the host and the network (domain) that it belongs to. Whenever you use that name, it is automatically converted to an IP address, which is then used to identify that Internet host. The fully qualified domain name is far easier to use than its corresponding IP address. For example, the name www.linux.org has an IP address of 198.182.196.56. A DNS server will translate www.linux.org into its IP address, 198.182.196.56. In Figure 7-1 the user at rabbit.mytrek.com wants to connect to the remote host lizard.mytrek.com. rabbit.mytrek.com first sends a request to the network's DNS server-in this case, turtle.mytrek.com-to look up the name lizard.mytrek.com and find its IP address. It then returns the IP address for lizard.mytrek.com, 192.168.0.3, to the requesting host, rabbit.mytrek.com. With the IP address, the user at rabbit.mytrek.com can then connect to lizard.mytrek.com.
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Figure 7-1: DNS server operation
You can then set up domain name services for your network by running a DNS server on one of the machines. This machine becomes your network's DNS server. You can then give your machines fully qualified domain names and configure your DNS server to translate the names to their corresponding IP addresses. As shown in Figure 7-2, for example, you could give the machine 192.168.0.1 the name turtle.mytrek.com, and the machine 192.168.0.2 the name rabbit.mytrek.com. You can also implement Internet services on your network such as FTP, Web, and mail services by setting up servers for them on your machines. You can then configure your DNS server to let users access those services using fully qualified domain names. For example, for mytrek.com network, the Web server could be accessed using the name www.mytrek.com.
Figure 7-2: DNS server and network Note Instead of a Domain Name Service, you could have the /etc/hosts files in each machine contain the entire list of IP addresses and domain names for all the machines in your network. But, for any changes, you would have to update each machine's /etc/hosts file.
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