Weixian, Could you please try the ping command like this (if you are working on linux):
*sudo ping 192.168.200.2 -i 0.01* -i 0.01 means the time interval between pings is 0.01 second. And tell me what happened. You can try different time intervals. On Fri, Jun 15, 2012 at 5:37 PM, Alex Zhang <cingular.a...@gmail.com> wrote: > I did the test by myself, and the most of the time ARP queries failed.... > I met this problem when I do the OFDM link test, but that is because the > physical layer is not robust. But for this narrow band (GMSK) modulation, I > am not sure what the problem is. > > May Josh knows... :) > > > On Fri, Jun 15, 2012 at 3:05 PM, Alex Zhang <cingular.a...@gmail.com>wrote: > >> Something like discarded. >> >> >> On Fri, Jun 15, 2012 at 11:59 AM, Weixian Zhou <idea...@gmail.com> wrote: >> >>> What do you mean by "it may be consumed"? >>> >>> >>> On Fri, Jun 15, 2012 at 12:44 PM, Alex Zhang <cingular.a...@gmail.com>wrote: >>> >>>> Did you see RX False at the receiver for the ARP reply? If that is not >>>> seen, it could be due to some reason causing the ARP reply is not sent out >>>> at all. Although you see the log for the TX packet in the CSMA mainloop, >>>> but it may be consumed before or when it goes to the transmitting path... >>>> >>>> On Fri, Jun 15, 2012 at 10:49 AM, Weixian Zhou <idea...@gmail.com>wrote: >>>> >>>>> Yes, the ARP is replied. But another machine did not received and >>>>> showed "Destination Host Unreachable". >>>>> >>>>> On Fri, Jun 15, 2012 at 11:19 AM, Alex Zhang >>>>> <cingular.a...@gmail.com>wrote: >>>>> >>>>>> Do you check the ARP reply is sent out or not? >>>>>> I am not sure if there are some flow control issues for the >>>>>> networking. >>>>>> >>>>>> >>>>>> On Fri, Jun 15, 2012 at 10:02 AM, Weixian Zhou <idea...@gmail.com>wrote: >>>>>> >>>>>>> Thanks for responses. The problem that confused me is that when I >>>>>>> on machine A: >>>>>>> *sudo ./tunnel.py --tx-freq=2.51G --rx-freq=2.515G -c 50 -r 0.5M * >>>>>>> then >>>>>>> *sudo ifconfig gr0 192.168.200.1* >>>>>>> >>>>>>> on machine B: >>>>>>> *sudo ./tunnel.py --tx-freq=2.515G --rx-freq=2.51G -c 50 -r 0.5M * >>>>>>> then >>>>>>> *sudo ifconfig gr0 192.168.200.2* >>>>>>> >>>>>>> I can see packages tx/rx succeed on both machines. But the ping >>>>>>> failed and one machine did not rx. Why is that? >>>>>>> >>>>>>> On Thu, Jun 14, 2012 at 4:38 PM, Alex Zhang <cingular.a...@gmail.com >>>>>>> > wrote: >>>>>>> >>>>>>>> Most likely you did not set the freq and gain properly. Unstable >>>>>>>> physical layer communications cause the ARP routing failure. >>>>>>>> Please use different frequencies for tx and rx. >>>>>>>> >>>>>>>> On Thu, Jun 14, 2012 at 1:51 PM, Weixian Zhou <idea...@gmail.com>wrote: >>>>>>>> >>>>>>>>> I was testing with tunnel.py and following the instructions in >>>>>>>>> README located in gnuradio/gr-digital/examples/narrwoband. >>>>>>>>> I found that when I input* ifconfig gr0 192.168.200.1* on machine >>>>>>>>> A, and input* ifconfig gr0 192.168.200.2* on machine B at the >>>>>>>>> same time, both machines showed Tx and Rx packages. >>>>>>>>> But when I* ping 192.168.200.2* from machine A ( or *ping >>>>>>>>> 192.168.200.1* from machine B respectively), one window of >>>>>>>>> machine A only showed Tx packages and another window showed >>>>>>>>> "Destination >>>>>>>>> Host Unreachable". Machine B showed both Rx/Tx packages. >>>>>>>>> It means that machine B can successfully received packages from >>>>>>>>> machine A but A failed to receive replied packages from machine B. It >>>>>>>>> confused me that the packages tx/rx were succeed before the ping. >>>>>>>>> Anyone >>>>>>>>> has idea? >>>>>>>>> >>>>>>>>> -- >>>>>>>>> Regards, >>>>>>>>> Weixian Zhou >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>>> Discuss-gnuradio mailing list >>>>>>>>> Discuss-gnuradio@gnu.org >>>>>>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>>>>>> >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> >>>>>>>> Alex, >>>>>>>> *Dreams can come true – just believe.* >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> Regards, >>>>>>> Weixian Zhou >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> >>>>>> Alex, >>>>>> *Dreams can come true – just believe.* >>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> Regards, >>>>> Weixian Zhou >>>>> >>>>> >>>>> >>>> >>>> >>>> -- >>>> >>>> Alex, >>>> *Dreams can come true – just believe.* >>>> >>>> >>> >>> >>> -- >>> Regards, >>> Weixian Zhou >>> >>> >>> >> >> >> -- >> >> Alex, >> *Dreams can come true – just believe.* >> >> > > > -- > > Alex, > *Dreams can come true – just believe.* > > -- Alex, *Dreams can come true – just believe.*
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