RPL is one of the candidate routing protocol designed for low power and lossy networks, where devices are constrained in memory, and energy (battery power) and limited processing. Devices in such a network operate at low data rates and experience packet losses. In addition, these devices are also susceptible to several security attacks due to open environment in which they operate. In this paper, we analyse the impact of packet dropping attacks on RPL. We analyse the performance of RPL in terms of number of additional distributed information objects, distributed advertisement objects generated to handle such attacks.