Questions tagged [networking]

Computer networking is the connection two or more computing devices for transmitting and sharing data. The devices use common communication protocols over a physical or wireless connection. Use this tag for questions about managing and using network connectivity on an Ubuntu system.

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How to suppress LAN connection messages

I have ubuntu 14.4 running with no LAN cable connected, on a user fixed user application. The system powers up starting the user-application then overlaying with a message telling the LAN is not ...
hcarlsen's user avatar
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iwlist failed to read scan data : network is down

I need to use my phone to write this since wifi on my Ubuntu labtop no longer functions. I'm using release 18.04 on a Lenovo ThinkPad. Kernel version is 4.15.0-23-generic. I started having problems ...
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Forward traffic from vpn clients to another vpn server

I have one vpn server(server A). Server A is connected to another vpn server(server B). Server A has some clients. Is it possible to route only traffic from vpn clients of server A to the connection ...
user854617's user avatar
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Ubuntu 18.04 Disable WiFi Device and enable Broadcomm connection on startup

Back to Ubuntu after years in MS. In Ubuntu Bionic Beaver: How to automatically disable Wifi device on startup? How to turn "Mobile Broadband = enabled" on startup? WiFi hardware: Intel Wireless ...
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Can't activate broadcom driver

I did a dual boot from Windows and I installed Ubuntu 18.04. On the 'try version' from my usb I could 'apply changes' in the Software & Updates => Additional Drivers to select: Using Broadcom 802....
Nilsfram's user avatar
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Enabling Host OS and Virtual OS Communicate with each other

I have been grappling with the issue of a lack of communication between the Host OS (Windows 7) and Ubuntu 64 (Virtual Machine). Current Virtual Box settings;- NETWORK:- Adapter 1: Bridged ...
Jaz's user avatar
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Snap applications unable to connect to the internet if VPN is turned on?

I use ExpressVPN to keep my internet browsing private in public places. Whenever I am connected to any VPN server, Snap apps such as Discord and Spotify are unable to connect to the internet. I have ...
Crypto Wiz's user avatar
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Networking Issue - Ubuntu 18.04

I have an Ubuntu Server (18.04 LTS) VPS setup on a HYPER-V host system.. The Ubuntu network interface is configured as follows: # This file describes the network interfaces available on your system ...
Dave Long's user avatar
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Ubuntu 16: Neither wired nor wireless adapter can be detected

I recently purchased a new Intel NUC (nuc7i5bnh). I installed Ubuntu 16, but it seems no wired or wireless adapters can be detected. When I type ifconfig in the terminal, it shows lrg@14:~$ ifconfig ...
T. Wu's user avatar
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Wifi not working on Ubuntu 18.04, Qualcomm Atheros Device abcd (rev 01)

I'm having trouble getting my wifi to work. It works fine in Windows though. lspci displays Qualcomm Atheros Device abcd (rev 01) *-network UNCLAIMED description: Ethernet controller product: ...
Robert Petty's user avatar
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Server can't ping Ubuntu desktop, but desktop can ping the server

The main computer cannot ping the Ubuntu desktop, but the desktop can ping other machines. What may be the issue?
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Wireless connection notifications not showing up ubuntu 18.04

I'm running ubuntu 18.04. Wireless is working fine but I'm not notified when I'm connected or disconnected. I've checked using dconf-editor the settings in org->gnome->nm-applet and ...
Leo Simon's user avatar
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Netplan / systemd-networkd VLAN is missing

I tried to add a additional virtual VLAN Interface, but it is not visible in ifconfig. Netplan Config: network: version: 2 renderer: networkd ethernets: ...
yannik995's user avatar
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Auto-mounting several Windows shared-folders doesn't always work

I've got a problem with network shared-folders configuration in fstab: I'm on Ubuntu 18.04. I've modified my /etc/fstab, adding these lines: //192.168.x.x/Common_space /media/common_space cifs _netdev,...
V Damoy's user avatar
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slow wifi ubuntu 18.04 with intel card

I have tried the usual things of disabling my ipv6 and have changed the conf files too but my wifi is very slow. Here is the content of the file cat /etc/modprobe.d/iwlwifi.conf # /etc/modprobe.d/...
curiousengineer's user avatar
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Ubuntu 18.04 configure but disable network interface

I created a dummy0 interface, (which is not currently supported by netplan) with systemd-networkd config syntax, as shown in my answer here: Ubuntu 18.04: How to create a persistent dummy network ...
Christian's user avatar
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Bluetooth PAN: permanent piconet

I need to create a PAN with BlueZ 5, to form a piconet (the most basic Bluetooth network) and send TCP/IP traffic on it. I must not share internet access, it should be a simple private PAN between the ...
Lorenzo Ancora's user avatar
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OpenVPN connection timing out

I've been trying to get my vpn running on my ubuntu build for a few months now.For some reason, any connection I attempt always times out. I've been using this guide and though I follow the directions ...
dropTableUsers's user avatar
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3G USB dongles not working in Ubuntu 18.04

I have just installed Ubuntu 18.04 in my system, It's not recognizing my iBall 3.5G USB modem, Which was working fine in the previous version (Ubuntu 16.04) On Ubuntu 14.04 I was able to access ...
Sumithran's user avatar
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correct driver for MacBook? Driver is good?

From Lubuntu 18.04. I'm not sure where the problem lies with this older computer. Most likely culprits: driver or hardware. Since the Wi-Fi seems to keep a connection fine when booting to Mac OS, ...
Thufir's user avatar
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Ubuntu 14.04 4 nic networking

I have the following.. eth3 - default route, usb dongle to the internet. 192.168.8.0/24 eth2 - nic to wireless router for streaming webcam 192.168.3.0/24 eth1 - nic to wireless router for ...
Aunty Entity's user avatar
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DNS benchmark and namebench on ubuntu return different results

I have queried DNS Benchmark to find a list of DNS servers that are possibly faster than my ISP's. It is the first time at all I use this tool and the results are a bit confusing: I have also run ...
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Wifi Problem: Connection failed (Activation of network connection failed)

I am using TP-link TL823N V2 wiresless adapter. Everytime I start the computer, the wifi is stopped from connecting with the message Connection Failed (Activation of network connection failed), even ...
Pranab Singh's user avatar
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ssh can't connet to the puplic ip and can't connet to ssh acount

Can anyone help me? When I try with my Internal IP but they don't work, When I try with my public IP, it gives me: [email protected].*******'s password: sshd listensocks[14] Connection to 46.153.27.142 ...
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Netem jitter generation problem

I am using netem and tc to generate network impairments in my network. I have noticed that after I have upgraded my server from 16.04 to 18.04 the jitter functionality is not working properly. The ...
Georgi Stoyanov's user avatar
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Ubuntu 18.04, network interface enp9s0 disappears suddenly

I am new to ubuntu, and I am using ubuntu 18.04 server. I configured the network interface enp9s0 with static address using netplan, and everything was working fine. Suddenly the the network interface ...
Liban's user avatar
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Server 18.04 | Daily server connection issues

I have a problem I was not able to figure out by googling: We recently installed a Ubuntu Server 18.04 on our vmware vSphere. After a few minor keyboard issues on the console and a few not so minor ...
zpwis's user avatar
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I have no connectivity with wifi or Ethernet

I had a problem with Wifi connectivity that I thought was to do with the Realtek Network hardware on my HP laptop so I tried some of the fixes online and ended up with no connectivity at all. I ...
Laura Jones's user avatar
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1 answer
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Enable wifi in ubuntu recovery mode

I have a ubuntu 16.04 laptop with grub 2.02 that I can only boot in the recovery mode, but cant use wifi to fix it. The situation is thie folowing: ifconfig -a shows me only loopback and ethernet ...
Sebastian's user avatar
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Connecting to iPhone hotspot with 16.04 LTS

My issue seems to be different from those in the many other threads that I've read. I have a Lenovo G50 laptop with 16.04 LTS installed. I dual-boot with Windows 10, but I haven't used that in months....
user848601's user avatar
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Problems with Ubuntu Server 18.04 installation

I am doing my best to troubleshoot the problem with my server. Here is the context. I have a dysfunctional server. It used to work. Let's say the SSD on it was formatted. I changed the RAM (store ...
Pastudent's user avatar
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Ubuntu 18.04 showing laptop-NOTEBOOK in network

Okay this might sound weird but I did a fresh install after struggling with various issues with Ubuntu 18.04. I saw the "Other Locations" in the file explorer and I saw My laptopname-NOTEBOOK in the ...
Peter's user avatar
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Can not SSH into machine from local network when gateway route is added to netplan config

Ok, so to SSH into this machine from the local network, I have had to set a route with the default gateway of the IP of the machine, I am sure this is wrong, my current config looks like this network:...
Jeffrey L. Roberts's user avatar
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0 answers
1k views

setting bip and fixed-cidr for daemon.json for Docker

How do I setup the bip and fixed-cidr for daemon.json file for Docker in Ubuntu 16.04 Xenial? more info on daemon.json here: https://github.com/docker/compose/issues/4336
Mona Jalal's user avatar
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WiFi inoperative ONLY when automatically connecting to VPN (18.04)

I connect to WiFi. Internet works. Then I manually connect to a VPN with network-manager-openvpn-gnome package (ie: top right corner VPN menu). Internet works. I set up "Automatically connect to VPN"...
PANDA Stack's user avatar
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Is it possible to restrict mounting of an USB stick to specific machine

The scenario You have an USB stick storage. You just want to use it only from your computer. It should be auto mounted from your computer and it should be available to all users of your computer ...
SaidbakR's user avatar
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Cannot connect Ubuntu 18.04 to WIRED router / network

Installed Ubuntu 18.04 as the only OS on Dell Optiplex 780 Intel Core 2 Duo E8400 / 3 GHz NO WI-FI available on this machine. Wired Ubuntu machine to a router with same Ethernet cable that 15 ...
Hi There's user avatar
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1k views

Ubuntu 18.04 + two network scanners

I have problems with using Samsung scanners connected via network. The issue is that in one physical location I'm using Samsung SCX-3200W printer/scanner, in a second one SCX-3405W (never both at the ...
user2707175's user avatar
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2k views

Ethernet not showing on ubuntu 18.04

I switched from windows 10 to ubuntu on my laptop(hp 15-bw085nd) and I don't have an ethernet connection or a wifi connection. When I use ifconfig -a it only shows my loopback. Maybe it has something ...
ldg's user avatar
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226 views

Ubuntu 18.04 VM doesn't have any network interfaces

I have created VMWare VM from ubuntu 18.04 installed on the physical partition. ifconfig shows only lo. I tried installing vmware-tools bundled with VMWare: they didn't work! I booted the Ubuntu at ...
Necktwi's user avatar
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3k views

Ubuntu 18.04 not resolving dns queries to specific host

I'm on my desktop machine (xubuntu 18.04, upgraded from xubuntu 16.04) and I'm trying to resolve www.cnmv.es and I get no answer: $ dig www.cnmv.es ; <<>> DiG 9.11.3-1ubuntu1.1-Ubuntu <...
xoner's user avatar
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"Network is unreachable" error for bash script at startup

I have a bash script that is run at startup on an Odroid running Ubuntu Mate. The script connects to the wifi and then calls a python script which makes a http request: ... nmcli dev connect ...
firion's user avatar
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698 views

error while configuring bind

I get this error when i try to verify the dns configs: /etc/bind/named.conf.options:27: unknown option 'sudo' these are my configs: $ sudo nano /etc/bind/named.conf // This is the primary ...
William Simmons's user avatar
1 vote
0 answers
135 views

Compression on CUPS Print Server

I have a server at home with CUPS install and I am using it as a print server (1 usb photo printer and 1 network color printer). Using DDNS & port fowarding on my SOHO router, I am printing from ...
Puppy's user avatar
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1 vote
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4k views

network-manager-openconnect certificate verification failure

This issue has been around for a while and I haven't been able to find any solution for it. It's present in Ubuntu 18.04, and I had the same issue in 16.04. When establishing a VPN connection with ...
cuvy's user avatar
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468 views

Wireless troubleshooting using ZedAir H2 laptop

I bought a brand new laptop called ZedAir H2, and then installed Ubuntu 18.04 LTS. The WiFi connection has some trouble searching for hot spot. It shows this message: activation of network ...
alshahrani.moh's user avatar
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0 answers
80 views

On-Board Ethernet not working, but it works with a live session

I upgraded the motherboard in one of my Ubuntu 16.04 LTS servers. The On-board Ethernet is not working. Some utilities work (nslookup dig) others don't (ping, apt), but if I boot a Live session ...
rsteinmetz70112's user avatar
1 vote
2 answers
917 views

MAAS based on ubuntu18.04, nodes can not connect to the public network

MAAS 2.4 is based on Ubuntu 18.04. I have both my master and nodes, connect to the public network and private network. My router provides DHCP on 172.16.199.0/24 (Public Network, Gateway 172.16.199.1,...
梁昌源's user avatar
1 vote
2 answers
3k views

Static IP on LAN and DHCP on WLAN on Ubuntu 16.04

I use a Netbook with LAN and WLAN. On LAN I need a static IP for dev. On WLAN I dont can use a static IP because I am in different WLANs. Here is my interfaces: auto lo iface lo inet loopback auto ...
user6266369's user avatar
1 vote
0 answers
2k views

18.04 Server enable dhclient at start after the network card is initialised

First of all, I may be using an uncommon system: I installed Ubuntu 18.04 Server, and then installed the Mate core desktop to it. The network card RTL8111 was not automatically recognised, so I had to ...
Damn Vegetables's user avatar

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