Hi Rich, First thing to do is to trace the signal. I.e. what are the physical limits of the RF. Special wireless tools (like the Sniffer Wireless) are available to help you with this, but the software delivered with your Aironet can tell you a lot as well. If the signal stays within the building, 128-bits WEP and an access-control list (i.e. which MAC-addresses are allowed and which not) should be sufficient. If the signal spreads to for example the car-park, additional security measures are advisable. Depending on how much you're willing to spend, several options are available. A firewall behind the AP, VPN-tunnels, etc. are all expensive, but secure solutions. Again, which solution to go for depends on your security needs and how much you're willing to spend.
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