I saw something similar last week.

On Mon, Jul 14, 2014 at 8:21 AM, Marcus D. Leech <mle...@ripnet.com> wrote:

> Attached, you'll find a pair of very-simple .grcs
>
> One is a UDP sender (using a pair of UDP sinks)
>
> The other is a UDP receiver (using a pair of UDP sources)
>
> The sender clearly works, as verified by 'tcpdump' at the receiving
> system.  The ports are correct, etc.
>
> But *nothing* is coming out of the UDP sources.
>
> My MTU is 1500, so the UDP frame size of 1472 is correct.
>
> And, I'll repeat, 'tcpdump' sees the traffic.
>
>
> --
> Marcus Leech
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
>
>
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