I, too, faced a similar problem in my code albeit in a different scenario, but have been able to solve it after some thought. The root of the issue turned out to be a simple case of negligence on my part.
The error messages come from the file mac/phy.cc (line# 138 in ns-2.35), when the physical layer notices that the HDR_CMN(incoming_packet)-> direction is set to the value 0, even though you must have explicitly set the value to hdr_cmn::UP or hdr_cmn::DOWN. For me, this was happening because I did a free(packet) right after I called Scheduler::instance.schedule(...) to forward the packet. The schedule(...) function merely inserts an event in the event queue, so if the packet gets freed up by the time the event gets dispatched, its direction value would automatically disappear. I removed this line, and freed the packet in the receive action; consequently, the problem was removed. Hope this helps, Dhrubo. -- Dhrubojyoti Roy PhD Student (2nd year) Department of Computer Science and Engineering, The Ohio State University, 2015 Neil Avenue, Columbus, OH-43210. +1-740-417-5890
