packets filtering method in a wireless network system . the method includes following steps : using a first node of the wireless network system to transmit a packet to a switch of the wireless network system , using a receiving module of the switch to receive the packet , using an identifying module of the switch to sequentially compare an address information of the packet with a plurality of address data of an address list , and using a transmitting module of the switch to transmit the packet to a second node via a local area network if the address information of the packet corresponds to one of the address data of the address list .