In message , Roger
Bell_West  writes
>On 2020-06-13, Richard Kettlewell wrote:
>>...and nothing thereafter. The two 13032-byte packets do not appear.
>
>I think the OP said there wasn't any sort of switch or other
>packet-mangling device between the two machines - otherwise I'd be
>looking hard at that.
>

I didn't say such a thing.

Source Pi is plugged into a switch (used by 3 Pis in total).  That
switch is connected to another switch, which the target Pi (and one
other) is plugged into.  The second switch has two other branches of the
network connected to it, both of which have a Pi plugged into them.

In total there are 8 Pis on the network, with OS versions varying from
Wheezy to Buster.  All of them do a "push" rsync to the target machine,
seven across the network, and the target from its SD to the HDD.  All
work fine apart from this one machine.  The source machine does a "pull"
rsync from the targets HDD to the source's SSD.  This also works OK.

So the only thing in this that I can see is unique is the source
machine.

To reiterate, the original machine was working fine, but failed (looks
like the power supply went, and took the Pi with it), so a new one was
put in, with a new SD card, which is when the problems started.  It
could be a hardware problem, but it seems to be a very specific case
where it fails, but then the same could be said to apply if it is a
software error.  And it doesn't always fail.

Adrian
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