1. Change the System ID: Devices come with a default system ID called the SSID (Service Set Identifier) or ESSID (Extended Service Set Identifier). It is easy for a people to find out what the default identifier is for each manufacturer of wireless equipment so you need to change this. Use something unique- not your name or something easily guessed.

2. Disable Identifier Broadcasting: Announcing that you have a wireless connection to the world is an invitation for hackers. You already know you have one so you don’t need to broadcast it. Check the manual for your hardware and figure out how to disable broadcasting.

3. Enable Encryption: WEP (Wired Equivalent Privacy) and WPA (Wi-Fi Protected Access) encrypt your data so that only the intended recipient is supposed to be able to read it.
WEP has many holes and is easily cracked. 128-bit keys impact performance slightly without a significant increase in security so 40-bit (or 64-bit on some equipment) encryption is just as well. As with all security measures there are ways around it, but by using encryption you will keep the casual hackers out of your systems. If possible, you should use WPA encryption (most older equipment can be upgraded to be WPA compatible). WPA fixes the security flaws in WEP but it is still subject to DOS (denial-of-service) attacks.

4. Restrict Traffic: Many wired and wireless routers have built-in firewalls. They are not the most technically advanced firewalls, but they help create one more line of defense. Read the manual for your hardware and learn how to configure your router to only allow incoming or outgoing traffic that you have approved.

5. Change the  Administrator Password: This is just good practice for ALL hardware and software. The default passwords are easily obtained and because so many people don’t bother to take the simple step of changing them they are usually what hackers try first. Make sure you change the default password on your wireless router / access point to something that is not easily guessed like your last name.

6.  Protect Your PC’s: As a last line of defense you should have personal firewall software such as Sygate, Zone Alarm,McAffe  and anti-virus software installed on your computer. As important as installing the anti-virus software, you must keep it up to date. New viruses are discovered daily and anti-virus software vendors generally release updates at least once a week. You also must keep up to date with patches for known security vulnerabilities. For Microsoft operating systems you can use Windows Update to try and help keep you current with patches.