Method for managing and sharing symmetric flow and asymmetric flow in duplexed network

A network duplexing method as an operation method of a network duplexing apparatus including a master unit and a plurality of network interface units, the network duplexing method comprising:

• analyzing, by the network interface unit, a flow flowing in the network interface unit;
• storing, by the network interface unit, information of the flow when information of the flow is not generated;
• determining, by the network interface unit, whether the flow corresponds to an asymmetric flow, providing the information of the flow to the master unit when the flow corresponds to the asymmetric flow, and requesting information of an opposite side flow of the flow from the master unit to receive the requested information;
• storing, by the master unit, the information of the flow provided from the network interface unit;
• and
• determining, by the master unit, whether the information of the opposite side flow of the flow is stored, and providing the information of the opposite side flow to the network interface unit when the information of the opposite side flow is stored.