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[Discuss-gnuradio] N310-B210 TUN/TAP Transmit and Receive Simultaneously

From: Ramazan Çetin
Subject: [Discuss-gnuradio] N310-B210 TUN/TAP Transmit and Receive Simultaneously
Date: Fri, 25 Jan 2019 15:25:27 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

Hi all,

I am trying to setup a communication system which uses OFDM and TUN/TAP interface. My OFDM is working good. I used rx_ofdm and tx_ofdm examples and combined them. I transmitted files without errors from N310 to B210 and B210 to N310.

But when i use the TUNTAP interface instead of file transmission, i can send ping (ARP packets) from N310 to B210. But i cannot send from B210 to N310. Red LED blinks on TX of B210, so it releases packet. Also, i can see the packet from N310's RX side using QT Time scope. But it cannot be resolved on N310. The USRP log on N310 when B210 send each ARP packet:

INFO: Detected an invalid packet at item 241776

INFO: Parser returned #f

When i remove the USRP source from B210 flowgraph, B210 can send ping to N310. (I can observe it from wireshark) So, i though problem can be related simultaneous transmission and reception. What can be problem? Any suggestion is appreciated. Thank you.

The flowgraphs for N310 and B210 are attached.

Best regards.

Attachment: ofdm_tx_n310_tuntap_with_rx.grc
Description: Text Data

Attachment: ofdm_rx_b210_tuntap_with_tx.grc
Description: Text Data

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