I was trying to get one of my controller PCs to talk to one of the hardware units we are developing. The hardware unit is a complex mixture of video processor hardware and controlling software. It runs VxWorks and was trying to find the controller PC by IP. The PC could ping most of the IPs external/internal to the subnet but could not ping the hardware unit. And the hardware unit could everything but this particular PC.
The IT guy came around and tried loads of different things including nameserver settings, installing drivers and physical cable checks. I thought this could be a router problem. But apparently there was no router between these two machines.
After much wasted hours and sanity, he decided to replace the NIC. And that was that. It was a faulty NIC which worked for most things other than pinging my hardware unit. Strange.
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