No internet under Ubuntu 22.04 after booting into Windows 10

sciguy sciguy at vex.net
Sun Dec 18 15:09:16 UTC 2022


First of all, a big thanks to everyone for responding. I got a lot more 
questions than I expected, and I will do my best to answer them here.

To explain, the router and NIC work perfectly under Windows 10, so I 
feel any talk about a firmware upgrade seems like a red herring, unless 
there is something Linux-specific that I am missing. The Linksys EA7300 
router is working, which is how I can read email from the list and 
respond to them like I'm doing now in Windows, on the same machine with 
the dodgy Linux network configuration. But I did go through the trouble 
of checking, and yes, the router firmware is the most current.

I am learning that the dual IP address issue is itself a red herring, 
since the router is indeed using DHCP, and these assignments are likely 
the result of reboots which trigger DHCP reassigning a new IP. Thanks to 
Bret Busby for that.

I was able to see the router because I was in windows 10. That's where I 
noticed over my web browser, that the router had 2 different IPs for 
this same machine, depending on whether it was a W10 hostname or a Linux 
hostname.

The network card, according to my Windows software, is described as an: 
"Intel Ethernet Connection I217-V", so it's not a Broadcom. It is part 
of the motherboard, which is a Asus Maximus Hero VI.

The "Network" icon, and "Settings" were the first things I checked. 
There was not much there, and I didn't see an IP. The output of the IP 
commands sent to you earlier, as well as dhclient, all recognised the 
NIC and labelled as "eno1", also showed no IP. The IP is on the router 
from an earlier time when Linux was online.

I can say to be fair Linux sees the network very seldom, but it does see 
it from time to time, even as recently as two days ago before I had a 
reason to boot into Windows. I am perplexed as to what makes Linux 
"decide" when to connect and when not to. Most of the time, it doesn't.

Since the network installation in Linux was dodgy, I deleted the 
configuration that came under the Network icon to see if it 
auto-detected anything. After rebooting, nothing came, but I wondered 
why it wouldn't auto-detect the network card and the network itself (it 
does if I boot with a live Linux DVD, for instance).

Paul King




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