Applicable Versions
NetSim Standard
NetSim Pro


Out-of-order delivery is the delivery of the packet in a different order from which they were sent. 

Out-of-order delivery can be caused by packets following multiple paths through a network, or via parallel processing paths within network equipment that are not designed to ensure that packet ordering is preserved.

TCP prevents out-of-order delivery and hence users would notice that whenever TCP is enabled in the transport layer, the number of out-of-order packets would always be zero.

Typically out of order delivery packets occur when running MANET, WSN simulations with UDP in the transport layer.

A document explaining the steps to arrive at the number of out-of-order packets from the event trace is attached below