Once you have established a (X web hosting) wireless LAN interface,
Once you have established a wireless LAN interface, you can use a variety of Linux software to monitor and control access to that interface. For example, you can protect the interface by setting up the Linux system as a firewall, a proxy server, or a router. In other words, the wireless interface can be used in the same way you would use a wired Ethernet LAN interface. To use server and router features, you need to install the appropriate software packages as well. Setting Up a Wireless LAN Before you begin testing the distances you can obtain with your wireless Linux LAN, I recommend that you configure wireless cards on two computers that are within a few feet of each other. Once the two computers are communicating, you can change wireless settings to tune the connection and begin testing the transmission distances you can achieve. The text that follows describes the steps you need to take to set up a wireless LAN between two Linux systems. Although only two nodes are described, you can add more computers to your wireless once you know how. This procedure describes how to operate your wireless Linux LAN in two different modes: Ad hoc All of the computers in your wireless LAN are gathered into a single virtual network that is made up of only one cell. A single cell means that you cannot roam between different groups of wireless nodes and continue your communication invisibly. To do that requires a managed network. Managed As noted earlier, many wireless cards that are supported in Linux cannot operate as an access point. A Linux wireless card, however, can operate as a node in a managed network. The wireless configuration tools that come with Red Hat Linux let you identify the access point for Linux to use by indicating the access point’s MAC address. Choose equipment Start with two computers. You can add more computers later, once you understand how to get your wireless interfaces working. For this procedure, I used computers that had the following characteristics (you can use different computer and cards, if you like): Computers One computer was a laptop with an available PCMCIA slot; the other was a desktop system with only PCI slots. Wireless cards As mentioned earlier, I purchased two Agere (Lucent Technologies) Orinoco wireless LAN cards: one Gold Label and one Silver Label. For the desktop computer, I purchased a PCI adapter card because it had no PCMCIA slot in it. Both cards come with built-in antennas, so there was no need for additional antennas while I set up the two computers (in the same room) for wireless communication. Note The only difference between the Gold and Silver Label cards is support for more secure encryption on the Gold card, so there was no reason for me to choose two different types of cards. If I had it to do over again, I would have used two Silver cards and saved a few dollars. Red Hat Linux I installed Red Hat Linux on both machines, selecting a Laptop install for the laptop and an “Everything” install for the desktop computer. (The Everything install was not strictly
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