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Today s networks are no longer limited to using cabled, or wired, devices Today s networks have a mix of wired systems along with wireless systems that use radio waves to send data to a wireless access point (as shown in Figure 7-14) The wireless access point may have a connection to the wired network, allowing the wireless devices to communicate with the entire network There are two popular wireless modes found in wireless environments today: ad-hoc mode and infrastructure mode With ad-hoc mode the wireless device is connected to other wireless devices in a peer-to-peer environment without the need for a wireless access point With infrastructure mode, the wireless devices are connected to a wireless access point and access network resources through that access point (as shown in Figure 7-15) As mentioned previously, the wireless client can access network resources on the wired network once connected to the access point because the access point has a connection to the wired network
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FIGURE 7-14
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A wireless access point, also known as a wireless router
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FIGURE 7-15
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Wireless access point Computer C
Server
Wireless Standards
The IEEE committee has developed wireless standards in the 802 project modes Wireless is de ned by the 80211 project model and has several standards de ned in this project model:
Wireless Networking
80211a: De nes wireless environments running at 54 Mbps while using a frequency of 5 GHz 80111b: De nes wireless environments at 11 Mbps while using a frequency of 24 GHz These devices are compatible with 80211g devices because they run at the same frequency and follow the WiFi standard 80211g: De nes wireless environments at 54 Mbps using a frequency of 24 GHz 80211g devices are compatible with 80211b devices because they both follow the WiFi standard and run at the same frequency
My wireless network at my home has an access point that is an 80211b device, and my laptop has an 80211g wireless network card I am still able to have my new laptop 80211b runs at 11 Mbps, communicate on the network because the whereas 80211g runs at 54 Mbps two standards are 100% compatible with one another I don t realize the 54 Mbps that my wireless network card supports, but I am able to communicate at the lowest speed supported by both devices which is 11 Mbps Wireless transmission speeds decrease the further you are from the wireless access point
Wireless Security
A few years ago when I purchased my rst wireless router, I knew nothing about wireless and was concerned that I would not be able to set up the wireless network Well, my concerns were quickly dismissed when I took the wireless router (access point) out of the box and gave it power My laptop connected almost immediately! I was amazed at how easy it was to connect to the wireless network there was NO con guration required Then it dawned on me if my laptop connected with no con guration, what is stopping the rest of the world from connecting to my wireless network The answer of course is that nothing is stopping someone from sitting outside my yard and connecting to my wireless network I needed to gure out how to stop unauthorized access to my wireless access point There are a number of different techniques that you can use to prevent unauthorized persons from connecting to your wireless network You may want to implement some or all of these features To help secure your wireless infrastructure, you should set the following options:
7:
Remote Connectivity
Security set identi er (SSID): The SSID is a name that you give the wireless network Clients need to specify the name in their wireless network card settings in order to connect to the wireless network The problem with wireless routers is that they are con gured to advertise this SSID automatically; therefore, an individual can connect to your network by name without really knowing the name of the network because the router is advertising it It is important that you consider disabling the broadcasting of the SSID after setting its value MAC address ltering: Most wireless networks allow you to limit which wireless network cards can connect to the wireless access point You can limit these cards by using the MAC address of the card By default, wireless access points are not con gured for MAC address ltering, so you want to make sure that you con gure it Wired equivalent privacy (WEP): WEP is a feature used to encrypt content between the wireless client and the access point When con guring WEP you must con gure the wireless access point with an encryption key and then make sure that each wireless client is using the same key Be aware that WEP encryption has been cracked with products such as AirSnort, so it is not the be-all and end-all of wireless security Always use the largest encryption cipher strength your wireless access point and wireless cards support (for example, 128-bit versus 64-bit)
There are a number of additional security precautions to take with wireless, including building a VPN solution and forcing the wireless client to connect to the VPN server before getting access to the corporate network Now that you have an understanding of some basic steps to con gure wireless, let s take a look at an exercise on implementing these security features on a LinkSys wireless router
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