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Re: [Discuss-gnuradio] find_usrps only succeed when an sniffer is ON

From: Jorge Miguel
Subject: Re: [Discuss-gnuradio] find_usrps only succeed when an sniffer is ON
Date: Thu, 9 Sep 2010 09:23:03 +0200


Thanks for your answer. My interface is completely 'up' after both
commands (promisc up and -promisc). But host computer and USRP2 can
only communicate when my network is in promiscuous mode.

I connect both, host computer and USRP2 through a direct connection
with a 1 Gb ethernet wire (no switches)

I only have one Ethernet interface in my host computer (eth0) and
permissions con /usr/bin/usrp2_socket_opener
are set to 4775.

I still cannot figure out what the problem is.


>> I installed GNU Radio on a ThinkPad Lenovo T4410 under Ubuntu 10.04.
>> After connecting the USRP2 with the original Ettus code on the SD card
>> D and F LEDs are ok and when executed:
>> ~$ sudo find_usrps
>> No USRP2 found.
>> I run wireshark or tcpdump to see what happens in my network and I got:
>> ~$ sudo find_usrps
>> 00:50:c2:85:35:a2 hw_rev = 0x0400
>> If I stop the sniffer, I get again:
>> ~$ sudo find_usrps
>> No USRP2 found.
>> My problem is that 'find_usrps' only works when a sniffer is running.
>> How can it be explained?
>> Jorge,
On 8 September 2010 19:25, Michael Ossmann <address@hidden> wrote:
> On Wed, Sep 08, 2010 at 09:18:10AM +0200, Jorge Miguel wrote:
>> Only when setting my Ethernet interface to promiscuous mode with:
>>      sudo ifconfig eth0 promisc up
>> 'find_usrps' does work perfectly.
>> If I execute
>>      sudo ifconfig eth0 -promisc
>> Again there is no connection with the USRP2
> Is the interface "up" after the latter command?

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