10 ways to wireless security

• Tags:
• Security,
• WPA,
• Wi-Fi,
• WEP

Deb Shinder

Published: 30 Sep 2005 15:30 BST

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4. Turn off SSID broadcasting
The Service Set Identifier (SSID) is the name of your wireless network. By default, most WAPs broadcast the SSID. This makes it easy for users to find the network, as it shows up on their list of available networks on their wireless client computers. If you turn off broadcasting, users will have to know the SSID to connect. Some folks will tell you that turning off SSID broadcasting is useless because a hacker can use packet sniffing software to capture the SSID even if broadcasting is turned off. That's true, but why make it easier for them? That's like saying burglars can buy lockpicks, so locking the door is useless. Turning off broadcasting won't deter a serious hacker, but it will protect from the casual "piggybacker" (for example, a next door neighbor who notices the new network and decides to try connecting "just for fun").

5. Turn off the WAP when not in use
This one may seem simplistic, but few companies or individuals do it. If you have wireless users connecting only at certain times, there's no reason to run the wireless network all the time and provide an opportunity for intruders. You can turn off the access point when it's not in use — such as at night when everyone goes home and there is no need for anyone to connect wirelessly.

6. Change the default SSID
Manufacturers provide a default SSID, often the equipment name (such as Linksys). The purpose of turning off SSID broadcasting was to prevent others from knowing the network name, but if you use the default name, it's not too difficult to guess. As mentioned, hackers can use tools to sniff the SSID, so don't change the name to something that gives them information about you or your company (such as the company name or your physical address).

7. Use MAC filtering
Most WAPs (although not some of the cheapest ones) will allow you to use media access control (MAC) address filtering. This means you can set up a "white list" of computers that are allowed to connect to your wireless network, based on the MAC or physical addresses assigned to their network cards. Communications from MAC addresses that aren't on the list will be refused.

The method isn't foolproof, since it's possible for hackers to capture packets transmitted over the wireless network and determine a valid MAC address of one of your users and then spoof the address. But it does make things more difficult for a would-be intruder, and that's what security is really all about.

For the final three tips, click here...

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