Your wireless LAN should (Web and email hosting) be operating at this
Your wireless LAN should be operating at this point. If you are not able to communicate with other wireless nodes or if transmission is slow, you may have more work to do. For example, if you see messages that say “Destination Host Unreachable”, instead of the output shown above, refer to the section on “Troubleshooting a wireless LAN” for help. If you want to fine-tune your wireless interface, refer to the “Manually configuring wireless cards” section that follows. Testing out distances Although you may be thrilled to have a wireless LAN working between two computers, you will probably want these computers to be located some distance from each other to make the LAN useful. Getting your wireless LAN to work at the desired distances can be quite a challenge. See the section titled “Selecting antennas” earlier in this chapter for suggestions on selecting and using antennas to configure the type of wireless LAN you are interested in. Wireless Security The Wireless Ethernet Compatibility Alliance (WECA) recently presented recommendations in response to security concerns about wireless networks. Unlike wired networks where you can often physically protect your wires within a building, wireless networks often extend outside physical boundaries that can be protected. Wireless Equivalent Privacy (WEP) adds encryption to the 802.11 wireless standard. WECA refers to WEP as its way of providing “walls” that make wireless Ethernet as secure as wired Ethernet. However, you need to implement WEP, as well as other security methods that would apply to any computer network, for your wireless network to be most secure. Here are WECA’s suggestions: Change the default WEP encryption key and change the key you use on a regular basis (possibly weekly or even daily for more security). This prevents casual drive-by hackers from being able to read your encrypted transmissions. Use password protection on your drives and folders. Change the default ESSID (Network ID). Use session keys if available in your product (session keys are not supported in current Linux wireless drivers). Use MAC address filtering (which is supported in a limited way in Linux). Use a VPN system, which can add another layer of encryption beyond that which is available on your wireless network. For larger organizations requiring greater security, WECA suggests such features as firewalls or user verification schemes (such as Kerberos). As I mentioned earlier in this chapter, features for protecting from intrusions and restricting services are already built into Red Hat Linux. Refer to the security tools described in
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