On Thu, Jun 6, 2013 at 3:22 PM, Jay Prakash <jay.prakash.ec...@itbhu.ac.in> wrote: > We are working on establishing a tunnel for MAC protocol design using > tunnel.py given as example in GNU Radio but are unable to receive ping reply > from the other node. > > We created tun/tap interface using ./tunnel.py -f 990M and ipconfig > 192.168.200.1 on Machine A connected to N210 series of USRP. > and ./tunnel.py -f 990M and ifconfig 192.168.200.2 on machine B. > > 1. Now on pinging machine B from A we can see ping packets being sent to B > by A using wireshark, but there is no reply on node A. > > 2. We went into details and saw there were ARQ requests from B repetitively. > I manually added the mac address to update the table. > Now ARQ request ceased to exist but still there were no replies on A. > > > 3. Since we knew the Packaging details of ICMP we read the packets being > received by B and found the exact source address of A from the frame. It > means message have been successfully decoded by the destination and it knows > whom to reply for the ping but still I don't find any reception confirmation > on source side. > > What may be the possible problems?USRP antenna gain?Packets collision? > > In short we are unable to use tunnely.py and are seeking for possible > causes. > > Jay Prakash > Senior Undergraduate
You could be having gain issues. Test this using the standard uhd_siggen and uhd_fft programs to understand what settings give you the best gain. Also, try using different frequencies for transmit and receive (use the -h on the command line to figure out how to do this). Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
