I am indeed running inside a VM presently. Details below:

Hardware:
USRP N210 (2x) connected to dual-port gigabit ethernet card: http://www.newegg.com/Product/Product.aspx?Item=N82E16833166096

Software:
    Windows 7 host OS
    VirtualBox VM running Mint Linux 17.1 (Mate Desktop edition)
    Network settings:
            + Adapter enabled and attached to NAT
            + No port forwarding settings defined

It may be noteworthy that the receive operation of the USRPs works as expected. Only transmit doesn't appear to be working properly.

Thanks,
George


On 7/9/2015 9:11 AM, mle...@ripnet.com wrote:

This is usually due to your network subsystem re-ordering packets, which is never supposed to happen but certain
 1GiGe interfaces, particularly USB ones, do this quite a bit.

Are you running inside a VM?

What kind of network interface do you have?

On 2015-07-09 09:09, George Hadley wrote:

Hello,

         I'm working on developing some gnuradio exercises, some of which 
involve using USRP N210 devices as transmitters. When I attempt to run the 
related flowgraphs, I get a stream of sequence errors (S) in the GRC log 
window. Attached are a pair of GRC flowgraphs in which I am getting this error. 
I have tried installing the latest images to the USRPs and updating to the 
latest version of gnuradio available on the github master branch. Can somebody 
please point me to what I'm doing wrong? I've searched around on the topic for 
quite awhile, to no avail.

Thanks,
George


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George Hadley
ECE Lab Coordinator
Purdue University

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