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

[Ramazan Çetin]

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.

ofdm_tx_n310_tuntap_with_rx.grc
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ofdm_rx_b210_tuntap_with_tx.grc
Description: Text Data