How to keep your wireless networks safe

introduction

Wireless networks are becoming more and more common. Sometimes called Wi-Fi or 802.11 (after the standards which define how it works), they allow computers to connect to one another without cables. Using radio technology similar to cordless phones, they make it incredibly easy to connect to company networks, email and the internet. Unfortunately, they also make it very easy for outsiders to do the same.

How to keep it safe

•	Don't broadcast the name of the network (known as the SSID)
•	Change the default SSID to something more obscure. Don't use a name that identifies your organisation
•	If possible and if your access point allows it, restrict wireless access to normal office hours
•	Use MAC filtering. Each network card has a unique code called a MAC address. You can set access points to restrict access to certain, trusted MAC addresses
•	Switch on and use the built-in encryption to prevent eavesdropping
•	Restrict the ability of users (and network administrators) to set up 'quick and dirty' wireless networks, even temporarily. One rogue access point can undo all the good work you do on the others
•	Make sure all your other security measures - passwords etc. - are in place so that you have a second line of defence against intruders