There is disclosed a method, an apparatus, a computing device, and a storage medium for testing a network. A plurality of packets may be received. A packet group identification number for each packet may be determined by extracting two or more packet group identification fields from the packet, each packet group identification field located at a respective offset from one of a signature field, a start of the packet, a start of an IP header, and a start of a protocol header; and combining the two or more packet group identification fields to form the packet group identification number. The network testing system may measure, compile, and store performance statistics for packets having the same packet group identification number.