WLAN security goes a little beyond wired LANs. Stay safe and don't pay for a costly mistake that can be avoided....
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This tip is directed toward IT professionals and network administrators.
WLAN's are fast, reliable, but how do you protect your WLAN and your investment? I am assuming you are running more than a home network and you have servers running.
DO NOT allow SMTP relay.
DO use SMTP authentication.
Get a Firewall/NAT router (we use Cisco.)
Secure all user accounts with hard to guess passwords.
Monitor your network traffic and block unknown IP/ranges.
If you use a VPN - secure it too.
Backup all data!
Use http authorization to get to the Internet. Some proxy servers support this. Proxy + is a good one.
Use a stateful packet inspection firewall.
Update A/V definitions daily if possible.
If you need better than normal authentication, try using an RSA SecurID solution, smart cards, or similar.
WLAN's are vulernable and it is a good idea to follow a few simple tips to better protect your WLAN. Hackers are smart too but when your WLAN is protected they very well may get frustrated give up.