Real-time identification of different TCP versions

When multiple flows using different versions of TCP exist together on the network, they are influenced seriously between each other. One of methods to overcome this problem is to control such flows individually by identifying the TCP versions of each flow. Thus, this process needs a method to identify online which TCP version is used for each flow. In this paper, we first focus on the increase speed of the congestion window in two different versions of TCP, which are TCP Reno and HSTCP (High Speed TCP). We also show that increasing rate of congestion window has remarkable characteristics in each TCP version. We then propose a method to identify flow by using the characteristics. We show that TCP Reno and HSTCP can be completely identified by using our proposed method.