3Com WL-603 User Manual page 77

Wireless Settings 75
AP Isolation Mode: AP Isolation is a function to prevent wireless clients
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connected with the device from communicating with one another.
When enabled, this creates a separate virtual network for your
wireless network, each of your wireless client will be in its own virtual
network and will not be able to communicate with each other. You
may want to utilize this feature if you have many guests that
frequently connect to your wireless network.