There are a few countermeasures you could follow to keep your wireless network safe from hackers.
1. Change your routers default password and make sure you have WAP encryption enabled. If your router doesn’t have a WAP option, use WEP. It is better than nothing.
2. Use a long secure password for your router. Include numbers, lowercase letters, uppercase letters and other symbols. The more obscure the better.
3. Make sure your router has the option to not broadcast your SSID enabled. This will prevent some programs like Net Stumbler from locating your wireless network.
4. Use MAC filtering on your router. Every wireless card and wireless adapter has a MAC address. By choosing to allow only your MAC addresses onto the network, you can keep a lot of attackers out.
5. To prevent packet sniffing attacks from affecting you, make sure the important sites you use, like banks, use SSL (Secure Socket Layer) encryption. You can tell if the site has SSL enabled if the URL begins with https:// instead of http:/.
6. In cafés or other hotspots where internet is free, packet sniffing is very common. To avoid being affected use a VPN (Virtual Private Network) service to encrypt the data you send across the internet.
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