Every IPv6 Thread packet translates to an IEEE® 802.15.4 data frame. The size of the packet gets defined by the size of headers and payload content. Depending on the size, a single IPv6 packet may be split into multiple IEEE 802.15.4 frames by the 6LoWPAN module. A Thread network usually consists of multiple routers that forward packets until they reach their destination or until the max-hop limit is reached. Some packets request a response; this response may or may not travel through the same number of hops until the reply packet reaches its destination. As Thread links are asymmetric, the reply may have a different number of hops to reach its destination. Based on multiple parameters like packet size, packet processing time, CCA back-off time and MAC acknowledge delay; the expected RTT of a packet under ideal conditions can be estimated.