Esse recurso ou bug específico é chamado de 'isolamento de ponto de acesso'.
Citando um membro do fórum da Cisco sharkbyte :
AP Isolation: Creates a separate virtual network for your wireless network. When this feature is enabled, each of your wireless client will be in its own virtual network and will not be able to communicate with each other. You may want to utilize this feature if you have many guests that frequent your wireless network.