tcpstat reports certain network interface statistics much like vmstat does for system statistics. It gets its information by either monitoring a specific interface, or by reading previously-saved tcpdump data from a file.
You can download it from the following link: https://packetstormsecurity.com/files/download/24239/tcpstat-1.4.tar.gz
Source: https://packetstormsecurity.com/files/24239/tcpstat-1.4.tar.gz.html