Hi Guanbo, You're running the script fine. If you look into the ftw_packet_utils.py script, you'll find that the encoder just prepends a static MAC header - Source Mac is 00:20:d6:01:3c:f1 (a quick web search will show that MAC Addresses which begin with 00:20:d6 belong to BREEZECOM). Similarly you' can find the destination* *MAC and BSSID. The packet will be decoded as a mac-layer service data unit (MSDU).
I'm not sure if you've done this already but make sure you set up your wireshark correctly by selecting "802.11" as the "Link-layer header type" in the "Capture Options" to receive 802.11 packets ( http://wiki.wireshark.org/CaptureSetup/WLAN) Let me know how it goes. Thanks, Ashu On 21 February 2011 18:36, Guanbo ZHENG <gbzhen...@gmail.com> wrote: > The frequency band is correct. Just now, I re-install the repository from > the CGRAN, and tried again using: > sudo python ftw_ofdm_tx.py -f 2.462G -i 5 --regime=8 --payload="Here are > some test messages from WiSeR" -r 10000 > So the only question is, I have NOT updated my firmware. I will try that as > well. > > By the way, what does the USRP2 generated packet look like in Wireshark at > another laptop? > > Thanks, > Guanbo > > > On Sun, Feb 20, 2011 at 11:32 PM, Ashutosh Grewal < > ashutoshgre...@gmail.com> wrote: > >> Hi Guanbo, >> >> Thanks for your reply. >> >> I've some good news regarding the FTW OFDM encoder - we were able to >> decode 802.11 a/g packets using kismet/wireshark later in the day. It seems >> that we'll have to set the OFDM coderegime option as 6 or 7 or 8 (I'm not >> sure about 8 but 6 definitely worked). The version information of our test >> system is same as that as what is used here - >> https://www.cgran.org/wiki/ftw80211ofdmtx but our USRP2 HW revision >> number is different and we used the latest firmware. >> >> Regarding BBN USRP2Version - I'll try that and get back to you in case I >> face any difficulties. >> >> Thanks, >> >> Ashu >> >> On 21 February 2011 00:07, Guanbo ZHENG <gbzhen...@gmail.com> wrote: >> >>> Regarding to BBN, you may try to the high interpolation and decimation >>> rate, as well as proper gain. I was able to decode it on RX (Ubuntu >>> 9.10+gnuradio 3.2.2) >>> >>> For FTW OFDM code, I was able to decode the 802.11g packet as well at >>> Wireshark using an Atheros 802.11a/b/g NIC in monitor mode, where I have >>> saved the TCPdump file. But recently I tried to re-conduct the experiment, I >>> can not get it anymore. :( >>> I am still trying to figure out what problem there is. >>> >>> Guanbo >>> >>> On Sun, Feb 20, 2011 at 3:13 PM, Sankalp Nimbhorkar < >>> sankalp.nimbhor...@gmail.com> wrote: >>> >>>> Dear All, >>>> We tried using this encoder to transmit frames with USRP2 >>>> XCVR 2450 daughter-card on Ubuntu 9.10. We confirmed transmission with a >>>> WiSpy dongle. But we cannot receive the frames on a receiver. The receiver >>>> we are using is an Atheros 802.11 a/b/g NIC in monitor mode with Mad WiFi >>>> driver. We have tried almost all the channels in 802.11a and 802.11g, but >>>> could not receive a single packet on receiver. In the project description >>>> we >>>> came to know that 802.11a frames were successfully received with a Ralinc >>>> NIC. Has anyone tried out this project? If so, please tell us the procedure >>>> to receive these frames with an NIC? Or at least some way to confirm that >>>> the frame was actually received by the NIC? (We even tried Kismet >>>> configured >>>> to report frames even if CRC check fails). Any help would be appreciated. >>>> >>>> Thank you. >>>> Sankalp Nimbhorkar >>>> CSC Graduate Student >>>> North Carolina State University >>>> >>>> _______________________________________________ >>>> Discuss-gnuradio mailing list >>>> Discuss-gnuradio@gnu.org >>>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>> >>>> >>> >>> >>> -- >>> Regards, >>> Brian >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >>> >> > > > -- > Regards, > Brian >
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