The following figure illustrates the use of different Onload stacks. Arrows indicate the receive path and fragmented UDP path.
Referring to the preceding figure, if one process were to transmit multicast datagrams, these would not be received by the second process. Onload is only able to accelerate transmitted multicast datagrams when they do not need to be delivered to other applications in the same host. Or more accurately, the multicast stream can only be delivered within the same Onload stack.