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You use the start, stop, and restart arguments to start, stop, and restart a service. To restart the DNS service you would use the following:
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To have a service start automatically, select the Text Mode Setup Tool from the Gnome System menu, then use the arrow keys to move down to the System Services entry and press ENTER. This will list the different service programs such as smb and named. To start the DNS service automatically, use the arrow keys to move to the named entry and press the SPACEBAR to select it (some services may already be selected). Use the TAB key to move to the OK button and press ENTER.
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To set up the physical connections between different computers on your system, you will need to install an Ethernet device on each. Some computers, such as Mac systems, may have this device built-in. Many computers may already have an Ethernet card installed. Most Ethernet configurations use lightweight cables to connect computers, though there are some that are wireless. The computers on a network are referred to as hosts. To connect several hosts together on a network, you will need Ethernet cables for each and a hub that will connect them all together. To connect up a host, connect one end of the cable to its Ethernet card and the other to the hub. A hub will have several plugs, one for each host on your network. For a larger network, you can connect several hubs together. In the configuration described here, the host running a Red Hat Linux system will be used as the main server and gateway for the local network. Here, you will install various servers like the DNS and Web servers. This host also will function to connect all the local hosts to the Internet (or a larger network). To do this effectively, this gateway/server host will need an Ethernet card and an Internet connection device such as a modem, DSL (digital subscriber line) modem, or another Ethernet card. The type of device you use depends on the type of service that your Internet service provider (ISP) gives you. Some provide only modem connections in which you dial in to connect to the Internet (AOL connections do not work for a LAN). Those that provide DSL connections will use a special DSL modem to allow you connect to the Internet. Both connect to a phone outlet. Cable modems, however, work like Ethernet networks. You need a second Ethernet network card that you connect to the cable modem. This is also the case if you are connecting directly to a larger Ethernet network. The examples in this chapter use a second Ethernet connection. Note Another kind of network configuration uses a coaxial cable (thin Ethernet cable) to which hosts connect directly instead of to a hub.
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When you start up your Red Hat system, Red Hat will automatically detect your Internet connection device and install the appropriate module for it. For some older Ethernet cards, you may have to perform special configuration tasks, such as making entries in /etc/modules.conf with certain parameters (see "Ethernet Parameters" in the Red Hat Reference Guide).
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If you want only to provide your hosts Internet Web access, you can do so by just running the Squid server on your gateway host. You will not have to set up and run a DNS server. Squid is a proxy server and can handle the Internet connection between a browser and Internet sites directly. You only have to configure the network connections for each host, providing their IP address. Squid is included with the basic installation. Note Squid also provides extensive security options, making it advisable to control Web access through a proxy server like Squid. Once it is installed on the gateway host, you then have to configure Squid to allow access by hosts on your network. Edit the /etc/squid/squid.conf file and place the following entries in the security section.
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