[SOLVED] Intermittent network function - both ethernet and wifi - how do I track down the cause?

GentleThotSeaMonkey · 05-07-2023, 08:59 PM

No harm: we all miss things, many times!

But I doubt that's the problem: it's OK to have both:
I tried on my Mint 21.1 plus many things say it's ok:
(unless Telus [model ?] oddly forbids that, or maybe [WAG_FUD] DHCP renew confuses resolved, or ...)

Code:

user@HP:~$ ip r
default via 192.168.1.254 dev eno1 proto dhcp metric 100 
default via 192.168.1.254 dev wlo1 proto dhcp metric 600 
169.254.0.0/16 dev wlo1 scope link metric 1000 
192.168.1.0/24 dev eno1 proto kernel scope link src 192.168.1.131 metric 100 
192.168.1.0/24 dev wlo1 proto kernel scope link src 192.168.1.230 metric 600 
user@HP:~$ resolvectl status; sudo cat /run/systemd/resolve/netif/{2,3}

business_kid · 05-08-2023, 05:21 AM

Glad it's sorted.

Don't think you're the only one who's ever done something stupid and messed things up. I certainly have. And most of the guys here would admit to it. It may have bheen Mark Twain who said

Quote:

Originally Posted by Mark Twain

What gets us into trouble ain't what we don't know. It's what we know for sure, but just ain't so.

wpeckham · 05-08-2023, 11:07 AM

That SHOULD not be the cause. I often have multiple interfaces up at the same time while WIFI is running, because I run multiple networks. (Only one has the default route and Internet access.)

business_kid · 05-08-2023, 11:32 AM

I agree. I ran two interfaces, eth0 and a wifi dongle here for a while because I was compiling half-assed wifi dongle drivers and doing speed tests and stuff.

In the OP's defence, he does use NetworkManager. If he got nm-tui going, his problems might vanish. But the less I know about NM, the better I like it. Alternatively, at least one of my ex-isps would throw me off periodically (2 hours?) and make me renegotiate a lease, so my IP could well change.

binkyd · 05-08-2023, 12:21 PM

Not fixed.
Worked for about 10 times as long before it failed. Wow.

Would somebody try to explain what I need to do to get internet without NetworkManager? And I don't understand what to change with nm-tui.
What I've looked at so far is just confusing the old brain here.

GentleThotSeaMonkey · 05-08-2023, 02:41 PM

Empathy for the frustration!

But what is really Really REALLY needed is: to collect some data as Clues. Start with: ip r; ping 8.8.8.8

(Are you able to open a terminal and do these, from a shell prompt? It's okay if not: LQ'ers will be glad to help you)

binkyd · 05-11-2023, 10:37 AM

I cheated.
Installed another instance of Mint on a spare partition, upgrading from Mint 20.3 to 21.1, and it has no issues so far.
Tried several Timeshift restores first, though, and even from a month ago this problem remained, so I said "Feck it" and used the nuclear option.
It was time.
Now we'll see if there's a hidden hardware issue or not; I'm hoping it was just a borked installation.

Thanks all.

business_kid · 05-11-2023, 11:07 AM

Generally, to get online, you need

With a wired connection, just a dhcp client and proper setup of basic files
With a wifi you need driver, firmware, a wpa_supplicant and a dhcp client, etc. If you have the wired option , go for it.