Roaming
Wireless roaming can
be very handy if your network is arranged in a way that you can
support it. In order for roaming to be possible, your APs all need to
be from the same manufacturer, they all need to reside on the same
physical wired subnet (i.e., on the same IP network with no
intervening routers), and all need to have the same Network
name (ESSID).
In the AirPort, roaming is automatically enabled if all of these are
true. Make sure that all of your AirPorts have the exact same
Network name under Wireless LAN
Settings. If for some reason you want to disable roaming,
just give each AirPort a different ESSID.
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