Manual ZyXEL NWD6605 (page 27 of 40) (English)

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Chapter 3 Wireless LANs

NWD Series User’s Guide

3.4.2 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. 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).

• When you use the push button connection method, there is a short period (from the moment you

press the button on one device to the moment you press the button on the other device) when

any WPS-enabled device could join the network. This is because the registrar has no way of

identifying the “correct” enrollee, and cannot differentiate between your enrollee and a rogue

device. This is a possible way for a hacker to gain access to a network.

You can easily check to see if this has happened. WPS works between only two devices

simultaneously, so if another device has enrolled your device will be unable to enroll, and will not

have access to the network. If this happens, open the access point’s configuration interface and

look at the list of associated clients (usually displayed by MAC address). It does not matter if the

access point is the WPS registrar, the enrollee, or was not involved in the WPS handshake; a

rogue device must still associate with the access point to gain access to the network. Check the

MAC addresses of your wireless clients (usually printed on a label on the bottom of the device). If

there is an unknown MAC address you can remove it or reset the AP.

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