Information processing device intended to serve as gateway between a local area communication network and a wide area communication network of an operator which comprises: - a plurality of physical ports (1.7, 1.8) making it possible to connect apparatuses of the local area network; - a physical port (1.15) connected to the wide area communication network of the operator; - a router (1.6) allowing the routing of the data streams between these various ports; - a NAT processing module for translating addresses into layer 3, - a direct circuit management module (1.5) for relaying directly without translation any traffic corresponding to a particular service arising from the wide area communication network of the operator to an apparatus of the local area network using said particular service and vice versa, - a local area DHCP server (1.4) for processing any DHCP request arising from an apparatus connected to said local area network, characterized in that it is intended to receive the connection of one of said physical ports (1.7; 1.8) of apparatuses possessing a plurality of layer 2 virtual addresses, at least one (1.11) of which is dedicated to a particular service; and in that it comprises: - means for detecting, in any DHCP discovery request that said device receives from a connected apparatus, the presence or otherwise of a marker making it possible to distinguish any DHCP discovery request relating to said particular service from any other DHCP discovery request, - means for relaying any DHCP discovery request for which such a marker has been detected to a remote DHCP server (1.17) of the wide area communication network of the operator, without, contrary to any DHCP discovery request for which such a marker has not been detected, it being processed by said local area DHCP server (1.4); - means for configuring, on detection of such a marker, the direct circuit management module (1.5) with the aid of the layer 2 virtual address at the origin of said particular DHCP discovery request in such a way that said direct circuit management module (1.5) then establishes a layer 2 direct circuit between the physical port (1.15) connected to the wide area communication network of the operator and one of the physical ports making it possible to connect apparatuses of the local area network (1.7) for any traffic carrying said layer 2 virtual address, the traffic not involved in said direct circuit being the subject of a translation of addresses into layer 3 by the NAT processing module. - a plurality of physical ports (1.7, 1.8) making it possible to connect apparatuses of the local area network; - a physical port (1.15) connected to the wide area communication network of the operator; - a router (1.6) allowing the routing of the data streams between these various ports; - a NAT processing module for translating addresses into layer 3, - a direct circuit management module (1.5) for relaying directly without translation any traffic corresponding to a particular service arising from the wide area communication network of the operator to an apparatus of the local area network using said particular service and vice versa, - a local area DHCP server (1.4) for processing any DHCP request arising from an apparatus connected to said local area network, - means for detecting, in any DHCP discovery request that said device receives from a connected apparatus, the presence or otherwise of a marker making it possible to distinguish any DHCP discovery request relating to said particular service from any other DHCP discovery request, - means for relaying any DHCP discovery request for which such a marker has been detected to a remote DHCP server (1.17) of the wide area communication network of the operator, without, contrary to any DHCP discovery request for which such a marker has not been detected, it being processed by said local area DHCP server (1.4); - means for configuring, on detection of such a marker, the direct circuit management module (1.5) with the aid of the layer 2 virtual address at the origin of said particular DHCP discovery request in such a way that said direct circuit management module (1.5) then establishes a layer 2 direct circuit between the physical port (1.15) connected to the wide area communication network of the operator and one of the physical ports making it possible to connect apparatuses of the local area network (1.7) for any traffic carrying said layer 2 virtual address,