Score:0

Ubuntu

Limited internet access

Gustavo Coelho Alves Costa

1/17/23, 9:50 PM

My computer suddenly has question mark over the wired connection icon and I can't connect to certain sites and services (such as vnc and slack) but it can still open Gmail, Google drive and YouTube. I've set up VNC server and it was working just fine but on the following day and after being automatically suspended I could no longer remotely access the server and all this mess with the internet started.

I've tried several solutions I found online but nothing works. When I tried:

sudo service network-manager restart

The icon becomes great and there's a 'x's over the bottom right square:

Do you have an idea of what might be wrong? Many thanks

sudo lshw -C network

  *-network
       description: Ethernet interface
       product: Ethernet Connection (5) I219-LM
       vendor: Intel Corporation
       physical id: 1f.6
       bus info: pci@0000:00:1f.6
       logical name: eno1
       version: 00
       serial: c8:f7:50:f8:ae:82
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.1-4 ip=128.120.197.86 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:32 memory:92f00000-92f1ffff

cat /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

cat /etc/netplan/*.yaml

# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager

MTU

eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536

0 + 0

internet

heynnema

1/17/23, 11:34 PM

Are you on DSL? What is the MTU setting in your "Wired Connection" profile? Edit your question and show me `sudo lshw -C network` and `cat /etc/network/interfaces` and `cat /etc/netplan/*.yaml`. Start comments to me with @heynnema or I'll miss them.

waltinator

1/17/23, 11:58 PM

Are you using Ubuntu? Which release?

user535733

1/18/23, 12:48 AM

When I get this, it's time to reboot the router. If it persists after rebooting the router, it's often a cable newly failed.

Gustavo Coelho Alves Costa

1/19/23, 12:41 AM

Hi all, thanks so much for your replies. Here are my answers: I'm using Ubuntu 18.04.5 and I'm connected to the institution network so I can't reboot the router. I replaced the cable already but I'll try another one that I'm sure it's working. I'll try these commands on Monday and I'll get back to you.

Gustavo Coelho Alves Costa

1/20/23, 4:17 PM

@user535733 I just replaced the cable and the problem persists.

Gustavo Coelho Alves Costa

1/20/23, 4:31 PM

@heynnema Thanks for your reply. I updated the question with the output from the commands you sent me and the MTU.

heynnema

1/20/23, 8:31 PM

@GustavoCoelhoAlvesCosta The `lshw` output shows "size: 100Mbit/s", instead of the 1Gb that it's capable of. That almost always means a cable problem. Are you using cat 5e or cat 6 cables?

Gustavo Coelho Alves Costa

1/20/23, 10:20 PM

@heynnema. I'm using cat 5e cable but it was working with it before. Could the problem be caused by the institution network limiting my access (due to VNC use)? It was working fine and it stopped by itself. The only thing I did was to test accessing it remotely, which worked, but then I did not have physically or remote access when this started.

heynnema

1/20/23, 11:38 PM

@GustavoCoelhoAlvesCosta Boot to a Ubuntu Live DVD/USB and see if you have full Internet access. Report back.

Gustavo Coelho Alves Costa

1/21/23, 10:11 PM

@heynnema Just did it and the problem persists. I did a mobile tethering and it worked just fine, so I believe it's a network issue and not a config in my PC. Right? The question mark was gone for a while but it got back though. But that didn't limit the connection.

heynnema

1/21/23, 10:25 PM

@GustavoCoelhoAlvesCosta Yes, when booted to the Ubuntu Live USB, if the problem is still there, then the problem is not with your Ubuntu installation, however you could have a hardware issue with the computer, or an external network issue with your cabling/hubs/switches/router/modem.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Limited internet access

TH: จำกัดการเข้าถึงอินเทอร์เน็ต

RO: Acces limitat la internet

RU: Ограниченный доступ в Интернет

VI: Truy cập internet hạn chế

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.