Patent ID: 8687609

Claim:
A method comprising: storing information indicating an association of wireless mobile client devices to their respective virtual local area networks; receiving a router advertisement message sent by a network router device; determining whether the router advertisement message is a multicast message; when it is determined that the router advertisement message is a multicast message, intercepting the router advertisement message and determining which of a plurality of virtual local area networks to which the router advertisement message is intended; generating a unicast router advertisement message to be sent to a local or roaming wireless mobile client device that is part of the virtual local area network for which the received router advertisement message is determined to be intended, wherein generating the unicast router advertisement message comprises changing a header field of the router advertisement message to replace a multicast destination address in the router advertisement message with a media access control address for the wireless mobile client device that is part of the virtual local area network for which the router advertisement message was intended; and suppressing a router advertisement message received from the network router device so as not to forward it to any one or more of a plurality of wireless access point devices associated with a controller based on a stored router advertisement frequency parameter.