Over the past decade, techniques for remote control vehicles (RCVs) have progressed a lot, and RCVs are receiving huge attention in various fields. Since RCVs, such as drones, have high mobility, it is important for operators to control RCVs reliably. Thus, to keep monitoring and controlling RCVs, operators continuously exchange control packets with RCVs by wireless. However, control packets can be delayed or lost due to any communication or network problems, which may cause collisions or crashes. To overcome this limitation, in this paper, we propose DupCon, a new control packet transmission scheme. Considering characteristics of packets, DupCon duplicates only control packets, not data packets, and transmits the originals and their duplicates through different paths, respectively. We designed and implemented DupCon on real devices. Moreover, we conduct an analysis on DupCon to demonstrate the validity of DupCon theoretically. Furthermore, we conducted various experiments, and the results show that DupCon improves reliability and stability of real-time remote vehicle control.