Gateway with improved QoS awareness

A device and method for exchanging data frames are disclosed. In one aspect, the device exchanges data between a WAN and one or more LAN segments in an optimized way leading to a better quality of experience for the user. The device comprises an interface exchanging data frames over an access network, at least a first and second subnet interface exchanging data frames and arranged for being coupled to a network, a memory storing classification rules, a classification agent extracting information from an incoming data frame and applying the rules to the extracted information to determine the interface via which the incoming data frame is to be forwarded, and a Quality of Service monitoring agent for retrieving Quality of Service information from the subnet interfaces and dynamically updating the classification rules according to the QoS information.