Nowadays, with the growth of computer networks, new requirements such as security issues, quality of service (QoS) and network monitoring have emerged that should be considered in designing network equipments. To meet these requirements, routers should be able to differentiate between packets of different traffic flows in order to deal with them based on their characteristics. This leads to the packet left; MARGIN: 0cm 0cm 0pt; unicode-bidi: embed; DIRECTION: ltr" align=left ` Keywords: Packet Calssification, Hash Table, Chinese Reminder Theorem, Decision Tree