Disclaimer: networking is not my expertise and i am learning as i go.
I have a computer lab connected with an unmanaged isolated network. the lab consists of 5 windows and an unmanaged netgear switch. The windows machines have never been connected to the internet and are running the OEMs windows 10 Pro install.
There is no router, DHCP/DNS server running - every machine has static IP set.
each machine is running different pieces of software and they communicate with various protocols. Mostly UDP broadcast, some Mulitcast and some TCP.
The Problem: after a few hours of everything thing running, lag builds up between machines. a simple ping across the switch shows a ~900 ms response time.
(in the software it looks like several seconds response time). The strange part is stopping all the software and/or rebooting the machines does not solve the problem.
The only "fix" I have found is removing the power to the switch (full discharge) and rebooting.
leaving the machines off but the switch on overnight does not clear the blockage.
I have tested a quick swap for a different switch and lag immediately disappeared.
Testing in progress:
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running with some applications stopped to find if one app is the issue. (this software configuration has worked in other peoples labs so this should be solve-able)
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long test with different switch to see if the issue replicates.
my uneducated questions:
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is there an issue with no network controller where unknown address fill the network que? (do I need a router/firewall with a blocking rule for non local lan addresses?)
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Is there some service in windows that could causing issues? (win update?)
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the switch itself could be faulty; is there a simple test to prove this?
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