Hi Generally if you are sending unicast, and there is no receiver, you will see multiple copies of the packet as the transmitter is expecting an ACK, and will retry until it gets one or it reaches the max number of retries. There are no ACKs on broadcast, so the transmitter will only send one.
Regards Michael On Fri, Jan 29, 2016 at 12:51 PM, Sugang Li <[email protected]> wrote: > Hi all, > > I am working on sniffer testing over SAMR21 board, here is my setup: > > 1. I have one node to send mac packet by calling txtsend. > 2. Another node is working as a Sniffer which is in the Promisc Mode set > by "ifconfig set promisc" > > However, whenever the transmitter send one pkt via unicast, the sniffer > will receiver will receive 4 pkt (each of them will have a different header > memory address). If it sends via broadcast mode, the sniffer only got one > pkt (this is correct). > > Any idea about this weird situation? > > Thanks, > > Sugang > > -- > > *WINLAB, Department of Electrical and Computer Engineering* > > *Rutgers,the State University of New Jersey* > > _______________________________________________ > devel mailing list > [email protected] > https://lists.riot-os.org/mailman/listinfo/devel > >
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