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I have a networked device (an old motion controller) that I have connected to my network via a switch. My PC is connected to the same switch. This configuration works as expected and I can ping and open TCP connections to the motion controller.
However, if I swap the switch with some other models then I can no longer ping/access the device. I've tried two other (otherwise working) switches and the device doesn't work with either. Generally speaking isn't a switch just a switch? What differences can I look for between the switches to troubleshoot this?
The switches I've tried (all gigabit) are:
Working:
D-Link DGS-1008D
TP-Link TL-SG1008D
Not working:
TP-Link TL-SG1016D
HP ProCurve 2708 J4898A
what is the device in question? – pete – 2015-08-26T01:36:28.543
This piece of... @pete. – 101 – 2015-08-26T01:44:08.407
do you have a simple hub you can place between the motion controller and the switch(es)? this would allow you capture packets, and also determine if there isn't some form of hardware incompatibility (eg, power-over-ethernet; energy-efficient-eth, etc...) – pete – 2015-08-26T02:05:48.890
possibly a helpful note for other readers, the controller uses modbus/TCP; i'm quite unfamiliar, but i did see one mention of occasional network issues involving message timing. – pete – 2015-08-26T02:14:40.247
Unfortunately not @pete. I might have a look with wireshark... – 101 – 2015-08-26T02:27:12.623
Yes it does use Modbus, but even pinging the device is not possible on the "bad" switches @pete. – 101 – 2015-08-26T02:32:19.190
Let us continue this discussion in chat.
– pete – 2015-08-26T02:41:50.957