Abstract: The present invention provides a lubricating oil composition comprising a lube base oil comprising a mineral oil and/or a synthetic oil; (A) an alkenylsuccinimide or an alkylsuccinimide and/or a boron-containing derivative thereof in an amount of 0.01 to 0.14% by mass based on the composition in terms of the nitrogen content as an ashless dispersant, wherein an alkenylsuccic acid monoimide or an alkylsuccinic acid monoimide and/or a boron-containing derivative thereof in the ashless dispersant is 0.05% by mass or less in terms of nitrogen content; and (B) a dialkyldiphenylamine compound in an amount of 0.3 to 5.0% by mass and a hindered phenol compound in an amount of 0 to 2.5% by mass based on the composition as an antioxidant, and (C) a sulfated ash of the lubricating oil composition is 1.2% by mass or less.

Abstract: A disclosed searching unit searches learning tables corresponding to ports other than a first port that receives a first packet using a source address and a destination address of the first packet whose source address and destination address are not registered in a first learning table corresponding to the first port. A transferring unit transfers contents of a second learning table, corresponding to a second port, to the first learning table, in response to the searching unit finding that the source address and the destination address of the first packet are registered in the second learning table. A port from which the first packet is to be sent out is determined based on the contents transferred to the first learning table.