[SOLVED]Internet cut off while WIFI is still on? Cause and Fix?

Questions about WIFI networks and devices
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loveLM
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[SOLVED]Internet cut off while WIFI is still on? Cause and Fix?

Post by loveLM » Tue Dec 05, 2017 8:52 am

Hi there,

I recently got a new laptop but found the following issues
1. The WIFI signal shows as 3/4, instead of 4 as my older laptop, does it mean it has a "weaker" network card?
2. Occasionally I experienced disconnecting such as :

This site can’t be reached
forums.linuxmint.com’s server DNS address could not be found.
DNS_PROBE_FINISHED_NXDOMAIN


However, the WIFI is always on. When I refresh the page, it usually comes back normally. I don't think this appears in my old laptop.
My seller only provides Windows support, and asked me to install Windows for testing, but I prefer not to.

I wonder what caused this? Is there anyway to detect problems in Linux? What should I check?
Last edited by loveLM on Wed Dec 06, 2017 3:02 pm, edited 1 time in total.

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Spearmint2
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Re: Internet cut off while WIFI is still on? Cause and Fix?

Post by Spearmint2 » Tue Dec 05, 2017 9:10 am

This site can’t be reached
forums.linuxmint.com’s server DNS address could not be found.
DNS_PROBE_FINISHED_NXDOMAIN
It means the DNS server which converts names to IP addresses has a problem finding a match for that web address, so the server is deficient. You could try some other DNS server like Free DNS or just use google's at IP 8.8.8.8 and secondary DNS at 8.8.4.4

https://www.google.com/search?q=free+DN ... channel=fs
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Pjotr
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Re: Internet cut off while WIFI is still on? Cause and Fix?

Post by Pjotr » Tue Dec 05, 2017 9:13 am

As Spearmint says. Easy how-to:
https://sites.google.com/site/easylinux ... our-system
(item 10, right column)
Tip: 10 things to do after installing Linux Mint 18.3 Sylvia
Keep your Linux Mint healthy: Avoid these 10 fatal mistakes
Twitter: twitter.com/easylinuxtips
All in all, horse sense simply makes sense.

loveLM
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Re: Internet cut off while WIFI is still on? Cause and Fix?

Post by loveLM » Tue Dec 05, 2017 12:36 pm

@Spearmint2 @ Pjotr
Thank you very much. I will try that and test for a day and see how it goes.

@Pjotr
I found the other tips you have on that site are very useful too. Will give it a read and do some tricks here and there.

Thanks for putting those up there for us newbies!

loveLM
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Re: Internet cut off while WIFI is still on? Cause and Fix?

Post by loveLM » Tue Dec 05, 2017 2:18 pm

Hey guys,

I did exactly what the it says and I checked

Code: Select all

more /etc/resolv.conf
to make sure googles ones are listed. But I still see the occasional DNS error message.

Does it have something to do with my ISP or my hardware? Anything more I could do? Thanks!

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Re: Internet cut off while WIFI is still on? Cause and Fix?

Post by Spearmint2 » Tue Dec 05, 2017 5:19 pm

Probably has to do with the DNS setting in your router. Access it's program and change that too.
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loveLM
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Re: Internet cut off while WIFI is still on? Cause and Fix?

Post by loveLM » Wed Dec 06, 2017 4:45 am

I am suspecting my laptop though. As this doesn't seem to happen in my old laptop, iphone, ipad or anything else who shares the same WIFI connection. I want to make sure it's not a defect due to hardware.

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Spearmint2
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Re: Internet cut off while WIFI is still on? Cause and Fix?

Post by Spearmint2 » Wed Dec 06, 2017 12:39 pm

Yes, there are DNS you can set on each computer's LAN and wifi connection, so should take a look there in the networking. The problem computer, was it used previously in a university setting? Reason I ask is they often assign a DNS server that is theirs which helps them restrict some content sites.
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Re: Internet cut off while WIFI is still on? Cause and Fix?

Post by loveLM » Wed Dec 06, 2017 1:29 pm

Hi there,

NOPE. The "problem" computer was bought last week. They installed a thrial Windows but I didn't test enough then I just directly installed LinuxMint. Now I found some issues but they can't provide support for Linux and I don't want to install Windows. So I would say... so far there is nothing else except the google ones I added in DNS configuration.

The problem isn't very serious. It usually connected again quickly after DNS error appeared. However it bothers me a bit and I want to make sure it's not due to hardware malfunctioning or anything.

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Spearmint2
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Re: Internet cut off while WIFI is still on? Cause and Fix?

Post by Spearmint2 » Wed Dec 06, 2017 2:15 pm

It could be the wifi device internal on laptop, that happens a lot with laptops, the way to see is use a USB wifi device and see if the problem goes away. If so, you have the choice of putting a new internal wifi into the laptop, or just continuing to use the external USB wifi. This is my favorite external that always works in Linux. You can see your neighbor's wifi signals half a block away, LOL.
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loveLM
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Re: Internet cut off while WIFI is still on? Cause and Fix?

Post by loveLM » Wed Dec 06, 2017 3:01 pm

Ah I see! Perhaps this means my new laptop might just have a "weaker" WIFI connection compared to the old one then.

I will mark the USB wifi for future reference and it seems interesting.

Right now I will mark it as solved for the moment.

Thank you for helping!

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Re: [SOLVED]Internet cut off while WIFI is still on? Cause and Fix?

Post by JeremyB » Wed Dec 06, 2017 5:55 pm

I would try

Code: Select all

sudo sed -i 's/wifi.powersave = 3/wifi.powersave = 2/' /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf

Code: Select all

systemctl restart network-manager.service
And see if the disconnects disappear

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