The invention provides a magnetic rubber composition prepared by kneading an anisotropic magnetic powder, alkoxysilane represented by the formula below, and a rubber binder:RaSiX4\u2212a where, in the formula, R is an alkyl group represented by CnH2n+1, X represents a hydrolysable group such as a methoxy group and an ethoxy group, and a represents an integer of 0 to 3. , a fluorine-containing sulfonylimide alkali metal salt such as lithium N,N-diimide, potassium N,N-diimide or sodium N,N-diimide is obtained. Further a device for use in design of a system is disclosed and also a tangible computer-readable medium storing instruction code thereon, that when executed causes one or more processors to perform steps for design of a system. Consequently, the first network device can re-order at least a subset of the plurality of packets based on the sequence identifiers associated with the plurality of packets.