ZyXEL Communications VMG Series User Manual page 150

Chapter 7 Wireless
• When you use the PBC 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.
VMG/XMG Series User's Guide
150