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How to tell if my network's faulty? (programming.dev)

submitted 2 days ago* (last edited 2 days ago) by staircase@programming.dev to c/linux@programming.dev

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I have a number of hints that my internet connection doesn't work right. I see things like can't connect to addresses from docker, pages will be slow in my browser. Before I used ethernet to my router, I would sometimes disconnect from the internet. Aside from disconnecting, none of it was a clear sign something is unusually broken. Is there some linux (Ubuntu) tool I can use to assess the long-term health of my connection?

A nice to have: the tool would tell me whether a fault is in my drivers, settings, adapter, router, connection to the house, or my provider.

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[–] frongt@lemmy.zip 10 points 2 days ago (2 children)

A network connection is a stack of many different parts. I don't think there's any tool that can pinpoint a problem in that way, at least not without a lot of customization.

I would use something like the OSI model, start at the bottom, and step through each layer and verify proper operation.

And also read logs on everything when the problem is happening.

[–] redlemace@lemmy.world 4 points 2 days ago (1 children)

Basically this. You could start easy and basic with gatus. Monitor at least your gateway, the isp gateway and dns resolving.

[–] staircase@programming.dev 1 points 2 days ago (1 children)

do you know if there's a free version of gatus? I could only see a 7 day trial

[–] redlemace@lemmy.world 1 points 2 days ago* (last edited 2 days ago)

Tried it a few months ago, self hosted was free https://github.com/TwiN/gatus

(Otherwise uptimekuma or something, there are plenty of tools out there. If you wanna do it right 1st time for free : checkmk and or librenms, but it might be overkill for you just yet)

[–] staircase@programming.dev 2 points 2 days ago

I have contemplated learning networking for other reasons. Will look at OSI

[–] towerful@programming.dev 8 points 2 days ago (3 children)

Let me honest with ourselves.... https://isitdns.com/

[–] redlemace@lemmy.world 1 points 2 days ago

And if not, it's mtu

[–] s38b35M5@lemmy.world 2 points 2 days ago

Its ALWAYS DNS

[–] staircase@programming.dev 1 points 2 days ago* (last edited 2 days ago)

I changed my DNS on the router. Page loads seem to be faster.

Also discovered Mullvad's fancy blocking DNS servers https://mullvad.net/en/help/dns-over-https-and-dns-over-tls

~~Just trying the docker thing to see if it works~~ docker test was inconclusive

will need much more time to see if reliability has generally improved