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Strange Ping behavior


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  • MVP 2023

Perhaps not strictly a Unitronics thing, and likely there's something I don't understand about the PING function, but often when I try to Ping a Unitronics PLC (connected directly to it from my laptop) I'll get this strange response (see screen cap).

Notice the laptop IP address is 192.168.62.251 and the PLC IP address is 192.168.62.208. However it tries to Ping 192.168.50.208. What is it trying to do here?

image.png

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  • MVP 2023

As far as I understand, the result of this test can be reproduced many times.

My thoughts:

1) perform this test without connecting the PLC;

2) dial 192.168.62.208 instead of 192.168.062.208;

3) repeat the test by switching the PLC to STOP mode;

4) test another PLC (not V700) with the same settings.

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  • MVP 2023
1 hour ago, kratmel said:

As far as I understand, the result of this test can be reproduced many times.

Yes it can.

1 hour ago, kratmel said:

My thoughts:

1) perform this test without connecting the PLC;

2) dial 192.168.62.208 instead of 192.168.062.208;

3) repeat the test by switching the PLC to STOP mode;

4) test another PLC (not V700) with the same settings.

Will do.

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  • MVP 2023

I've seen my A/V play funny buggers with addresses at times, with the virtual adapters it uses.  Try with it fully disabled, just to check that isn't the cause.

And you haven't forgotten any leftover static specs in the adapter settings that might be upsetting things?

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192.168.

192.168.50.208 may be a default gateway.

1. Run from DOS prompt "ipconfig /all" and look in list for 192.168.50.208.

2. It may be a Proxy Server, set by company's configuration.

Enter "Proxy" in search box and press ENTER.

Check if any Proxy settings are enabled.

Probably you may see 192.168.50.208 as a Proxy.

Disable Proxy and check ping again.

3. In DOS prompt enter "tracert 192.168.50.208 and press ENTER.

*It works slow.

4. You can ping 192.168.50.208 if you are at company network.

It may answer you if exists and if ping reply enabled for this IP by IT.

Summary (not full list):

Proxy, Firewall, VPNs, AntiVirus/AntiSpam and other security applications, running by IT.

. Sometime helps if you reboot your computer.

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  • MVP 2023

1. Done that - nothing found.

2. This is a personal laptop, no proxy servers.

3. I was connected directly to the PLC via crossover cable. No network, no wireless connection.

4. I should have tried to ping that address. Rats.

5. It's a laptop. It gets rebooted every time I use it.

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