The present invention relates to systems, apparatus, and methods of measuring bandwidth of a network connection. The method includes establishing a network connection between a sending terminal and a receiving terminal. The method further includes inserting a flag into a packet header for a packet. The flag is to indicate to the receiving terminal that a bandwidth measurement is in progress. The packet also includes a payload. The method further includes setting the flag in the packets header of the packet to true, and transmitting to the receiving terminal the packet. The method then sums arrival times of the packet and the payload for the packet, and calculates the bandwidth measurement of the network connection by dividing the summed payload value by the summed arrival times value.