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Chapter 3 Wireless LANs
NWD2705 User’s Guide
33
In step 3, you add another access point (AP2) to your network. AP2 is out of range of AP1, so you
cannot use AP1 for the WPS handshake with the new access point. However, you know that Client
2 supports the registrar function, so you use it to perform the WPS handshake instead.
Figure 23 WPS: Example Network Step 3
3.4.4 Limitations of WPS
WPS has some limitations of which you should be aware.
• When you use WPS, it works between two devices only. You cannot enroll multiple devices
simultaneously, you must enroll one after the other.
For instance, if you have two enrollees and one registrar you must set up the first enrollee (by
pressing the WPS button on the registrar and the first enrollee, for example), then check that it
successfully enrolled, then set up the second device in the same way.
• WPS works only with other WPS-enabled devices. However, you can still add non-WPS devices to
a network you already set up using WPS.
WPS works by automatically issuing a randomly-generated WPA-PSK or WPA2-PSK pre-shared
key from the registrar device to the enrollee devices (see Section 4.4.1.3 on page 42 for
information on pre-shared keys). Whether the network uses WPA-PSK or WPA2-PSK depends on
the device. You can check the configuration interface of the registrar device to discover the key
the network is using (if the device supports this feature). Then, you can enter the key into the
non-WPS device and join the network as normal (the non-WPS device must also support WPA-
PSK or WPA2-PSK).
CLIENT 1
AP1
REGISTRAR
CLIENT 2
EXISTING CONNECTION
S
E
C
U
R
I
T
Y
I
N
F
O
ENROLLEE
AP1
E
X
I
S
T
I
N
G
C
O
N
N
E
C
T
I
O
N