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You can configure your network so that hosts on your local network can access the Internet, using your gateway host's Internet connection. In this scheme, the host will pretend to be the gateway host, using its Internet connection as if it were its own. This way, you only need one Internet connection for all the hosts on your network. The method is called IP masquerading, and it works by the local hosts pretending to have the IP address of the gateway. In effect, all your local hosts share the same Internet IP address. First, make sure that iptables is enabled on your system. You can use the System services list in the Text Mode Setup utility to select iptables for automatic startup. Tip If you only want to provide Web access to users on your network, you just need to configure and run the Squid proxy server on your gateway. You do not need DNS or IP masquerading implemented. Note Be sure that a firewall program is not also running on any of your local hosts. This can happen if you ran lokkit on any of your local hosts. Run lokkit again on the local host and select No Firewall. This will shut off the firewall on that host. IP masquerading is implemented as part of the IP-Chains or IP-Tables firewall programs, depending on the one you are using. If you set up your firewall with lokkit, you are using IPChains. To implement IP masquerading, you need to add a new rule to the collection of rules already set up by lokkit. To do so, you need only enter a simple rule on the command line using the ipchains command, as shown here. The -o option is used to specify the device you are using for your Internet connection. The first Ethernet device, eth0, is used in this example. If you are using a modem, the device would be ppp0 for the first modem device. IP masquerading with iptables is described in detail in 40.
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ipchains -A forward -i eth0 -j MASQ
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You then use the iptables service script with the save option to save your new rule, along with the ones already set up by lokkit:
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The rules will be placed in the /etc/sysconfig/ipchains file, which will be read whenever you start up your system. Bear in mind that if you run lokkit again, it will overwrite this file. You will have to enter the iptables masquerading command again and save your rules to enable IP masquerading. Also, check to see if IP forwarding is turned on. You can do this with netcfg on the gateway host. Click the Routing panel and then click the check box at the top labeled Network Packet Forwarding. This sets the value of the /proc/sys/net/ipv4/ip_forward file to 1, turning on IP forwarding. You can do this manually instead if you want with the following command.
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echo 1 > /proc/sys/net/ipv4/ip_forward
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If you are using IP Tables, you follow much the same procedure, except that you do not use lokkit and you use iptables commands to implement firewall rules. The rule to add masquerading with IP Tables for a first Ethernet device (eth0) is as follows:
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iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
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Rules will be saved using the service command with the iptables option, instead of ipchains. They will be saved to the /etc/sysconfig/iptables file.
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service iptables save
Using Remote Printers
Once you have set up your network, you can use any Linux host to access printers connected to other hosts on the network, whether they be Linux, Windows, or Novell systems. The Linux host to which a printer is connected will first have to install that printer with printconf, as described in 4. Another Linux host can then access that printer by installing it as a remote printer. Once installed, the Linux host can print directly to that remote printer. For example, if an Epson printer is connected and installed on the turtle.mytrek.com host, the rabbit.mytrek.com host can install it as a remote printer, giving it a name of its own. Users on the rabbit.mytrek.com host can then print directly to the Epson printer connected on the turtle host. In fact, you could have all your printers connected to a single host and have all your other hosts print through it. You use the printconf tool to install a remote printer. Select Printer Configuration from the Gnome system menu and click the New button. A series of dialogs will be displayed for entering the printer name, the type of remote printer, the printer's remote queue name, and the remote host the printer is connected to. For other Linux systems, entries are displayed for both the hostname and the IP address for the remote host (see Figure 7-9). Be sure to also enter the device driver and name information as described in 4.
Figure 7-9: Remote Linux printer The method works similarly with both Windows and Netware systems. However, to access Windows systems, you have to set up and run Samba. Samba will interface a Linux network with a Window network, allowing access to devices on Windows hosts like printers, CDROMs, and file systems. Samba is described in detail in 37. To access a printer attached to a Windows system from a Linux host, you use the printconf tool on that Linux host to configure the printer as a remote Windows printer. In the printconf tool, select Queue and then select Windows Printer from the pop-up menu. Five entries are displayed. In the Share box, you enter the name of the Windows host, preceded by //, then followed by the name of the printer on that host, separated by a single slash. For example, the share name for a printer called myepson on the host lizard is
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