Disclosed herein is a bio-soluble inorganic fiber with high tensile strength, manufactured in a method comprising: heating and melting a raw material which includes, on a weight basis, 60 to 80 percent of SiO2, 5 to 20 percent of MgO, 5 to 30 percent of CaO, 0. A keeper has a main body with a attracted face, a screw part that is located at the back face, a conical tapered shaft, and a projecting ring part. The activation can be performed by causing fluid to flow through a bed of zeolite crystals impregnated with calcium chloride and sodium chlorite, and a bed of zeolite crystals impregnated with a proton generating species. The method may include tagging the network packets at the access concentrator with a port identifier that corresponds to a media access control address.