SUSE Linux 10 for dummies phần 6

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SUSE Linux 10 for dummies phần 6 125 Chapter 8: Setting Up an Ethernet LAN with Wireless Access Figure 8-2: Configurethe Ethernet network card with YaST.Connecting Your LAN to the Internet If you have a LAN with several PCs, you can connect the entire LAN to the Internet by using DSL or a cable modem. Basically, you can share the high- speed DSL or cable modem connection with all the PCs in the LAN. In Chapter 7, I explain how to set up a DSL or cable modem. In this section, I briefly explain how to connect a LAN to the Internet so that all the PCs can access the Internet. The most convenient way to connect a LAN to the Internet via DSL or cable modem is to buy a hardware device called DSL/Cable Modem NAT Router with a 4- or 8-port Ethernet hub. NAT stands for Network Address Translation, and the NAT router can translate many private IP addresses into a single externally known IP address. The Ethernet hub part appears to you as a number of RJ-45 Ethernet ports where you can connect the PCs to set up a LAN. In other words, you need only one extra box besides the DSL or cable modem. Figure 8-3 shows how you might connect your LAN to the Internet through a NAT router with a built-in Ethernet hub. Of course, you need a DSL or cable modem hookup for this scenario to work (and you have to sign up with the phone company for DSL service or with the cable provider for cable Internet service).126 Part II: Test-Driving SUSE To Internet Ethernet cable (10BaseT) NAT router and Ethernet hub Ethernet cables Cable or DSL modem (10BaseT) Figure 8-3: Connect your LAN to the Internet through a NAT router with a built- in Ethernet PCs in a local area network (LAN). Each PC must have a 10BaseT hub. Ethernet card. When you connect a LAN to the Internet, the NAT router acts as a gateway for your LAN. The NAT router also dynamically provides IP addresses to the PCs in your LAN. Therefore, on each PC, you have to set up the networking options to obtain the IP address dynamically. Your LAN can mix and match all kinds of computers — some may be running Linux and some may be running Microsoft Windows or any other operating system that supports TCP/IP. When configuring the network settings, remem- ber to select the option that enables Linux to automatically obtain IP address settings and DNS information with DHCP. Extending Your LAN with a Wireless Network If you have a laptop computer that you want to connect to your LAN — or if you don’t want to run a rat’s nest of wires to connect a PC to the LAN — you have the option of using a wireless Ethernet network. In a typical scenario, you have a cable modem or DSL connection to the Internet, and you want to connect one or more laptops with wireless network cards to access the Internet through the cable or DSL modem. In the following sections, I explain wireless networking and how to set it up on your network. 127 Chapter 8: Setting Up an Ethernet LAN with Wireless AccessUnderstanding wirelessEthernet networkingYou’ve probably heard about Wi-Fi. Wi-Fi stands for Wireless Fidelity network —a short-range wireless network similar to the wired Ethernet networks. Anumber of standards from an organization known as IEEE (the Institute ofElectrical and Electronics Engineers) defines the technical details of how Wi-Finetworks work. Manufacturers use these standards to build the componentsthat you can buy to set up a wireless network, also known as WLAN for short.Until mid-2003, there were two popular IEEE standards — 802.11a and802.11b — for wireless Ethernet networks. These two ...