User's Manual

Appendix D Wireless LANs
B222s User’s Guide
245
The following figure shows a WPS- enabled client ( inst alled in a notebook com put er) connect ing t o a
WPS- enabled access point .
Figure 169 How WPS works
The roles of registrar and enrollee last only as long as the WPS set up process is active ( t wo
m inut es) . The next t im e you use WPS, a differ ent device can be t he regist rar if necessary.
The WPS connect ion process is like a handshake; only two devices part icipat e in each WPS
transact ion. I f you want t o add m ore devices you should repeat t he process wit h one of t he exist ing
networked devices and the new device.
Note that t he access point ( AP) is not always t he registrar, and t he wireless client is not always the
enrollee. All WPS- cert ified APs can be a registrar, and so can som e WPS- enabled wireless client s.
By default , a WPS devices is “ unconfigured”. This m eans t hat it is not par t of an existing net w ork
and can act as eit her enrollee or registrar ( if it support s bot h funct ions) . I f the registrar is
unconfigured, the securit y sett ings it t ransm its t o the enrollee are random ly- generat ed. Once a
WPS- enabled device has connect ed t o another device using WPS, it becom es “ configured”. A
configured w ireless client can still act as enrollee or regist rar in subsequent WPS connections, but a
configured access point can no longer act as enrollee. I t will be t he registrar in all subsequent WPS
connect ions in which it is involved. I f you want a configured AP t o act as an enrollee, you m ust reset
it t o its factory defaults.
Example WPS Network Setup
This sect ion shows how securit y set t ings are dist ributed in an exam ple WPS setup.
The following figure shows an exam ple net work. I n st ep 1 , both AP1 and Client 1 are
unconfigured. When WPS is activat ed on bot h, t hey perform t he handshake. I n t his exam ple, AP1
SECURE TUNNEL
SECURITY INFO
WITHIN 2 MINUTES
COMMUNICATION
ACTIVATE
WPS
ACTIVATE
WPS
WPS HANDSHAKE
REGISTRARENROLLEE