Questions tagged [networking]

Managing and using network connectivity on a Ubuntu system

8,263 questions with no upvoted or accepted answers
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Ubuntu 18.04.2 LTS server - network configuration problem during setup

Has anyone had the same problem? When installing from current server iso's in a VMWare VM and without a DHCP Server present, both Ubuntu installers are not able to manualy configure a ethernet ...
9
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1answer
2k views

build-essential is not installed by default in 18.04. How to install network drivers offline?

We have a serious problem with new installations on laptops that have only a wireless network device requiring some network drivers, like bcmwl-kernel-source. Many laptops don't have an Ethenet port ...
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0answers
697 views

Can't access GitHub via Google Chrome?

I successfully run the command ping github.com. Output is like: PING github.com (192.30.253.112) 56(84) bytes of data. 64 bytes from lb-192-30-253-112-iad.github.com (192.30.253.112): icmp_seq=1 ttl=...
7
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1answer
281 views

How do I remove the long name given to my internet connection?

The other day my computer randomly started displaying the full name of my ethernet controller as you can see here: I'm fine with it saying Ethernet Controller like it used to but having the whole ...
6
votes
1answer
236 views

Torque: Unauthorized Request

Following this guide: https://jabriffa.wordpress.com/2015/02/11/installing-torquepbs-job-scheduler-on-ubuntu-14-04-lts/ I installed TORQUE on Ubuntu 16-04-lts (he claims the process works the same ...
6
votes
1answer
13k views

16.04 - curl: (35) gnutls_handshake() failed: Error in the pull function

When trying to connect to a HTTPS websites, I get this error curl: (35) gnutls_handshake() failed: Error in the pull function.. In detail: curl -vvv "https://example.tld" * Rebuilt URL to: https://...
6
votes
2answers
233 views

Is there a way to prevent USB over ethernet from working?

This video shows an attack where attaching a USB device to a locked computer pretty much takes over all currently running browsers. The trick is that the USB device acts as Ethernet over USB, and a ...
6
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0answers
4k views

Problem with PBISOpen and Ubuntu 14.04LTS

I'm testing openpbis 8.3 version and I have authentication problem when I'm trying to open new session on Ubuntu 14.04 LTS, not in local network but only in distant network. Adding the computer on ...
6
votes
1answer
727 views

(32) Ad-Hoc mode is not supported by this device. - 13.10 on i5 NUC

Not sure if this is an Ubuntu issue or intel issue. Any insights will be appreciated. I have an intel NUC (D54250WYK) w/ intel 7260 wireless adapter and Ubuntu 13.10. I can connect to my local wi-...
6
votes
3answers
20k views

Remote Access to Owncloud Server

I'm currently trying to setup my own own-cloud server, and I've got it fully installed, configured, and accessible from within my own local network. I cannot figure out how to access it from the ...
6
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0answers
816 views

How can I connect to Microsoft Direct Access?

My company has moved from Cisco VPN to Microsoft Direct Access. I was using network-manager-vpnc to connect from Ubuntu before. Can I use the same to connect to direct access? If not, how can I ...
6
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1answer
4k views

How to disconnect internet when VPN fails?

Normally I'm connected to the Internet with a VPN, but sometimes it fails and some programs may automatically start to use the default unsecure connection. How do I disconnect all the internet until ...
5
votes
1answer
179 views

Openvpn connection problem using network manager

I have problem with connecting to vpn my company gave me those files along with a password I tried to import them this way 1- I go to Network Setting 2- then I press the plus button to add new ...
5
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0answers
653 views

A stop job is running for Raise network interfaces (/1min 31s)

When I am trying to shutdown my pc running ubuntu 16.04.5 it will hang on this line: A stop job is running for Raise network interfaces (1s/1min 31s) This is my /etc/network/interfaces file: # This ...
5
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0answers
2k views

How to reset netplan to default in 18.04?

I tried creating a network bridge through Virtual Machine Manager for KVM. Now my Ubuntu network connection depends on my Windows KVM being booted. Since creating this bridge when Ubuntu is booted ...
5
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0answers
9k views

dnsmasq : failed to create listening socket for port 53: Address already in use

I'm trying to configure dnsmasq to work along with NetworkManager, the problem is when I try to run the service it fails with: dnsmasq: failed to create listening socket for port 53: Address already ...
5
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0answers
4k views

Cisco AnyConnect: Posture Assessment Failed: CSD library signature verification failed

All of a sudden AnyConnect stopped working. Version 4.5 on ubuntu 16.04. I'm now getting the following error when trying to connect. Any ideas on how to resolve it?
5
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1answer
1k views

How to convert existing Ubuntu install to minimal

I'm trying to convert existing Ubuntu install to minimal config so it can run off of 2GB SD card (or even smaller). Right now current hardware (Pi like board) needs custom 16.04 build to support ...
5
votes
1answer
2k views

Opening a port to an application accessible outside of localhost?

Though I have researched this all day, I still can not find a solution to this issue. On my Ubuntu Server I am trying to run a node.js application that simply prints out "Hello World" and runs on ...
5
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0answers
6k views

OpenVPN does not connect via network manager plugin

I am trying to connect to my OpenVPN server via the network manager plugin (network-manager-openvpn), after importing the ovpn config file. However, I receive a time-out error: $ grep VPN /var/log/...
5
votes
1answer
3k views

Apply static IP address change in /etc/network/interfaces in Ubuntu 16.04

TL;DR: In Ubuntu 14.04, If you change a static IP address in /etc/network/interfaces and apply the changes with ifdown and then ifup command everything works fine. But this sequence is not working in ...
5
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1answer
5k views

How to stop dhcp discover messages after dhcp release?

I configured a wrong interface as dhcp and did a ifdown and ifup on that interface. DHCP client keeps sending DHCP discover messages and I had to wait for a while for it stop. ctl+z or ctl+c didn't ...
5
votes
1answer
1k views

Freeze on losing network connection

When I mount a server file system that is located in a local network over nfs on my laptop, the processes interacting with the filesystem freeze / hang up whenever the network connection is lost. The ...
5
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0answers
2k views

Wifi keeps disconnecting on HP 2000-2c10DX

My wifi keeps dropping connection constantly. I really want to use Ubuntu as a main OS, but this wifi problem is an issue. In the past, upgrading the kernel fixed it, but it isn't fixing the problem ...
5
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0answers
1k views

How do I force nmcli to reconnect to different uuid?

I have a bash script that checks my network environment and mounts shares accordingly. If I'm at work and have a hard-wire connection to the LAN, then I'd like to activate a hotspot connection for ...
5
votes
1answer
18k views

Getting WiFi AP working with hostapd and isc-dhcp-server [Xubuntu 14.04]

I have tried using ap-hotspot from WebUpd8, and it did not work for me in 13.10 or 14.04, so I have been working on getting hostapd manually set up, using isc-dhcp-server since dnsmasq was having ...
5
votes
1answer
2k views

Cannot change Wifi settings, stuck on WEP Security

I just started using Linux and as such do not have a proper knowledge of how to use the command line and all of those sorts of things, so please try to bear with me :). I have been able to connect to ...
5
votes
1answer
3k views

Set a static IP to lubuntu on VirtualBox

I am using lubuntu 13.04 on a VirtualBox with a briged adapter. I want to make the IP of my VM static, I looked up on how to do this and many results came up. I went on and edited the interfaces file ...
5
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1answer
10k views

Openswan's ipsec verify fails on “Two or more interfaces found, checking IP forwarding”

I'm trying to set an L2TP/IPsec VPN. I have installed openswan from the repository on Ubuntu 13.04 Section: universe/net Architecture: amd64 Version: 1:2.6.38-1 and configured it following the ...
5
votes
1answer
5k views

Connected to wireless, but no internet access

After installing Ubuntu 12.04 a week ago wireless internet had been working fine. It stopped working yesterday, however, and I'm at a loss for what to do even after scouring replies to similar posted ...
5
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2answers
5k views

Wireless not connecting automatically

My wireless is working fine, but when I login, it does not connect automatically, I have to select it from the list each and every time to use it. Even though the connect automatically option is ...
5
votes
0answers
5k views

Playing Age of Empires II multiplayer in VirtualBox Over wi fi network

I installed Age of Empires II (Expansion) in VirtualBox (hosting Windows XP). It works great in single player mode. Unfortunately, I tried playing multiplayer via WI-FI which I created on my Ubuntu ...
5
votes
1answer
12k views

Bluetooth adapter not found in Ubuntu 16.04

Since my upgrade to 16.04 the OS does not find the bluetooth-adapter anymore. The Laptop is an Acer Aspire V5-573G and all i can find about the bluetooth adapter is this: "Bluetooth Qualcomm Atheros ...
5
votes
2answers
8k views

Can't control connection bit rate using iwconfig with Atheros TL-WN821N (AR7010)

I'm trying to reduce the connection bit rate on my Atheros TP-Link TL-WN821N v3 usb wifi adapter due to frequent instability issues (reported connection speed goes down to 1Mb/s and I have to ...
4
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0answers
157 views

NetHogs showing suspicious (outgoing) traffic to random ports from root on Ubuntu 16.04

Using NetHogs on an Ubuntu 16.04 (web) server, i.e. on a machine where no consumer applications or web browsers are installed, besides traffic that is to be expected (HTTP and SSH) PID USER ...
4
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0answers
495 views

DNS resolution in LXC container

I'm using srsLTE-emane (https://github.com/adjacentlink/srsLTE-emane), an open source software that emulates LTE Network, on Ubuntu 18.04.2, and I have a problem with DNS resolution in LXC container. ...
4
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0answers
127 views

Enable packet routing from network interface eth0 to bridge interface

I have a Ubuntu server connect to LAN 10.1.200.21/24 (bond0), and an Macbook connect to LAN 10.1.200.50/24 (eno1) There are another bridge create by brctl addbr br0 in Ubuntu 10.3.100.1/24, and there ...
4
votes
1answer
11k views

How to display/extend/mirror/cast Ubuntu 16.04 screen to a Samsung Smart TV that is connected to the same network?

How can I share/display what I am seeing on my Ubuntu system to a networked Samsung Smart TV? The Ubuntu system and Samsung Smart TV are LAN connected to the same network. The Ubuntu system is a ...
4
votes
1answer
1k views

ZTE Modem not working on Ubuntu 18.04

I have run the command lsusb and got the following code: Bus 001 Device 002: ID 8087:8000 Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0003 ...
4
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0answers
1k views

Unable to connect to Windows shared drive - I get repeatedly prompted for credentials

Running Ubuntu 18.04 LTS and I have a Surface Pro running Windows 10. I have a drive connected to my Windows machine with all my media on it and I want access it from the Ubuntu machine. I shared ...
4
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0answers
8k views

Unstable wifi connection - “activation of network connection failed” Ubuntu 18.04

I have installed Ubuntu 18.04 on my HP laptop. LAN cable works fine, but WIFI connection is terrible. It might work sometimes but starts weakening too soon - starts "connecting" and eventually says "...
4
votes
1answer
399 views

Ubuntu forgets custom DNS server after a while

I am using ubuntu 18.04 LTS and I have configured the IPv4 DNS to manual resolution always (Automatic = Off) and added 192.168.0.5 as my DNS server. So for a while it all works, pinging some servers ...
4
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0answers
1k views

Avahi daemon necessary? CPU load quiet high

While using htop for some other stuff I noticed a programm called 'avahi-daemon' which is using quiet a lot of my maximum CPU load and definitely more than all other programs. I read it is some kind ...
4
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0answers
150 views

How to automatically switch default printers based on your location

I wonder if is it possible to automatically switch the default printer according to the wifi network to which the computer is connected. Apparently, windows has this feature
4
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0answers
806 views

ubuntu 17.10 google drive takes more than 10 minutes to load

I have been looking for a solution for this for a while, but I haven found one on my own. I am using the native Google drive mounting in gnome with online accounts and nautilus, but it takes forever ...
4
votes
0answers
885 views

How to automatically bring up CAN interface in Ubuntu 17.10

In previous versions of Ubuntu I have been using this script to automatically bring up an network interface for a USB to CAN bridge device, whenever the device is plugged in: $ cat /etc/network/...
4
votes
1answer
2k views

bridge networking not working on ubuntu 16.04

I'm having a strange issue with kvm and bridged networking on several ubuntu servers running ubuntu 16.04. Bridged networking works fine on one of my servers, but doesn't work on my other three ...
4
votes
0answers
778 views

loopback network interface has no IP address

I can't figure out why my loopback device has no IP address. Here's /etc/network/interfaces: # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto ...
4
votes
0answers
184 views

dnsmasq for local resolution works after running dhclient, then stops working after a few minutes

I'm running into a strange issue. For the record, I'm using Ubuntu 17.10. I'm trying to configure a custom TLD, call it .mytld, to resolve to 127.0.0.1 so I can host local websites without needing to ...
4
votes
1answer
924 views

How can I network two computers together using Thunderbolt 3?

I have two computers, and I need to transfer a (very) large file between them. Both computers are Thunderbolt 3 compatible, and I have a passive Thunderbolt cable ready to use. Is there a way I ...

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