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audiodef
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PostPosted: Fri Jun 29, 2018 3:39 pm    Post subject: Is my motherboard faulty? Reply with quote

The built-in NIC on my desktop does not seem to keep connections alive. When I installed a PCIe NIC, the PCIe NIC had the exact same issue - connections will not stay alive reliably. In both cases, some time after booting up, ping results in 100% packet loss. Not even a reboot fixes it unless the desktop has been powered off for a while. If I plug in a USB wifi adapter, THAT stays alive. Another desktop of the exact same model does not have this problem. Is it safe to say this desktop might have a faulty motherboard?
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Ant P.
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PostPosted: Fri Jun 29, 2018 4:35 pm    Post subject: Reply with quote

Before you throw it out, a few questions: did you try the PCIe card in the other motherboard or just its onboard one, and for how long on each? And what's the other end plugged into? Does it take a lot of incoming connections?

I know the most likely diagnosis is broken mobo, but just the other day I had a hair-pulling problem where simply rebooting one box caused all kinds of bizarre network issues, I was convinced I'd done something wrong in a kernel upgrade, but it turned out to be the buggy modem-router on the other end at fault.
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khayyam
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PostPosted: Fri Jun 29, 2018 4:46 pm    Post subject: Reply with quote

audiodef ...

the fact that both the onboard NIC and the PCIe NIC experience the same issue would generally point me in the direction of the cable, router, or some hop between the host and the ping dest. If you have net-analyzer/mtr then run it using an external IP, and look at loss% and hop where this loss occurs. If the packet loss occurs between the host and the gateway (hop 1), then it could be the cable, or the gateway/port, swap out the cable, test, swap the port, test.

If neither of those offer an improvement, then you should then look at the software, can you reproduce with a sysresccd, or other live disk. This way you can narrow it down to hardware.

best ... khay
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1clue
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PostPosted: Fri Jun 29, 2018 4:56 pm    Post subject: Reply with quote

I second the cable check. Also you might want to try a different port on your switch before you bother with the cable.

Note that with a gigabit cable all 8 conductors are in use, and it's possible to get some really weird behavior. Also you might not think it but if there is a broken wire in the cable, the system temperature or vibration from fans can cause the cable to lose its connection. If your system starts up after a long down period, likely the fans are not running when the system comes up.

Another thing you might want to do is check inside for dust bunnies. Some of that dust can either conduct electricity or prevent it from being conducted. Either could be bad.
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audiodef
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PostPosted: Sat Jun 30, 2018 2:18 am    Post subject: Reply with quote

You guys are great, thanks for the responses.

I have some difficulty moving things around due to an injury, but yes, I do need to investigate things more, so... I will! I will keep your suggestions in mind.
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