Identification of Different TCP Versions Based on Cluster Analysis

When multiple flows using different versions of Transmission Control Protocol (TCP) exist together on a network, they seriously affect each other. One method to overcome this problem is to control such flows individually by identifying the TCP versions of each flow. Thus, for this process, it is necessary to identify online which TCP version is used in each flow. In this paper, we first focus on a method for controlling the congestion window (cwnd) in different versions of TCP. We find out characteristic values using this method and then propose a method to identify flow by using the characteristics. We show that any 2 out of 14 TCP versions that are implemented in Linux can be identified by using our proposed method.