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.
23,036
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Very slow boot time ubuntu - A start job is running for Raise network interfaces
I am running ubuntu 16.04 and since few days it takes around 5 min to boot up. I looked related questions but I could not find how to troubleshoot my problem. When I run:
systemd-analyze blame
I get ...
2
votes
0
answers
42
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19.10 - strange wifi issues
When I run from battery, my wifi often switches off, and I cannot enable it again without rebooting. It does not happen when I am on power, only on battery and only since upgrading.
Any ideas?
2
votes
0
answers
189
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weird DNS resolution problem
I am running Ubuntu 18.04, all updates. I encounter a consistent DNS resolution problem with exactly ONE web address, namely that of my university. It occurs when the following conditions are met:
[...
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vote
1
answer
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Kubuntu 19.10 iwlwifi error causing system hang
Update : The problem seems to be in kernel 5.3.0-24, while booting into 23 it is working fine.
From today my Kubuntu 19.10 system is hanging when it tries to connect to wifi. At the boot time it ...
0
votes
1
answer
670
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Ubuntu does no longer find host from DNS-Server after a while
Since a few days I have a Raspberry Pi with dnsmasq setup as DNS Server on 192.168.1.2 in my LAN. It helps other computers to find the server by name ... and it works great, except for my Ubuntu 18.04 ...
1
vote
2
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410
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A chromium thread using port no other than 443 or 80
I tried ss command to know the status of sockets in my system (ubuntu 14.10 ),
$ ss
tcp ESTAB 0 0 192.168.1.10:51492 74.125.236.200:https
tcp ESTAB 0 0 ...
0
votes
0
answers
44
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Running an Ubuntu wireless access point with NTLM
An ubuntu 18.04 server is located in our company behind a corporate proxy and should serve as an access point using a wifi usb adapter (wlan0 interface). Authentication is done via NTLM and CNTLM is ...
2
votes
1
answer
2k
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Not able to connect to wi-fi on Ubuntu in KVM
My primary OS is arch Linux.
I am using Ubuntu 18.04 on KVM. But only wired network option is available there. When I head over to wi-fi it is displaying network adapter is not available. I am not ...
2
votes
1
answer
118
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Is it possible to use WiFi Hotspot to serve files?
I want to be able to serve files from my laptop, over wifi, with no router or internet connection. My goal is to make it so that when I travel to the area without internet, my other devices(iPad) ...
0
votes
1
answer
493
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Ubuntu Not Recognizing WiFi Chip Intel AC 9260
I made a fresh install on new laptop with Ubuntu (several distros) 19.10 and the wifi chip is not recognized (there is no wifi setting). I tried installing 18.04 LTS but that didn't help. I tired many ...
13
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2
answers
35k
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Broadcom Wireless Drivers unclaimed after installing update 16.04
I recently updated my Lenovo Y50 computer to 16.04. Since the update, I have been unable to see or connect to any wireless networks. The output of running sudo lshw -C network is:
*-network ...
1
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0
answers
57
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Network fails with docking dongle
I've run into a very strange problem. I'm happily browsing along in Firefox when tabs become unresponsive. Typically the state is induced by loading a tab. When I attempt to do so, the loader icon in ...
1
vote
1
answer
2k
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Prepend nameserver to resolv.conf in Ubuntu 19.10
I'm trying to add a nameserver to the top of my resolv.conf file on Ubuntu 19.10. I want to always have the nameserver 127.0.0.1 at the top.
I have created a created a new file called:
/etc/...
0
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0
answers
357
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How to get Letsencrypt ssl certificate for local iis web server using local DNS server Bind9
I need help regarding for my iis web server in windows 10 Pro. I am using local DNS server bind9 to resolve the domain name and it works very well. But the problem is i am not able to generate ssl ...
2
votes
3
answers
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wired connection detected but no internet access in ubuntu 14.04 lts
i am having ubuntu 14.04 lts on machine.Though it is showing connected to LAN in network manager but it cant access internet.
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1
answer
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Ubuntu 18.04 No WiFi adapter found [Dell Inspiron 3542.]
Just installed Ubuntu 18.04 but my WiFi adapter Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter doesn't work or even appear in the system settings.
output of lspci -knn | grep Net -A3:
&...
1
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2
answers
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Find Camera IP address and subnet mask
I have an Ethernet camera which is directly connected to my Ubunut machine via Ethernet cable. I only know the MAC address of the camera and don't know its IP address or its subnet mask. I think that ...
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0
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Computer disconnects from WiFi and doesn't reconnect automatically
I'm running Ubuntu Desktop 19.10 and mostly use it as a server. Periodically (every few days) it drops off wifi and doesn't reconnect. Rebooting wi-fi AP doesn't help. Only manual reconnect/suspend&...
2
votes
1
answer
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ssh-copy-id no identities found ubuntu error [duplicate]
I have two machines that were setup exactly the same with the same name and users and everything exactly the same. Each machine has two users with this names userA (userA@UserA) and userB (userB@UserA)...
0
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0
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16.04 wifi network issues
I'm having a Wi-Fi problem and it seems to be with the driver. Every now and then the Wi-Fi randomly drops and it act like I don't even have a Wi-Fi card in the computer. I found sudo service-network ...
0
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1
answer
1k
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NetworkManager remove device if created from systemd
I create systemd script for bring up CAN interface in my Ubuntu 18.04 machine. Systemd script is as below:
[Unit]
Description=...
0
votes
0
answers
243
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19.10 5ghz speed slow compared to dual boot windows
I am running dual boot ubuntu 19.10 and windows 10 pro. When I'm connected to my home internet(500mbits up and down) via 5ghz, I am getting the following results:
Retrieving speedtest.net server list....
0
votes
1
answer
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Losing connection to server at every reboot (18.04 LTS)
I'm quite new to Linux in general. And did some "rookie" mistakes...
I tried to install Pi-Hole on my server, and did also install lighttpd (by mistake, I forgot that Apache2 was running).
Now, Pi-...
0
votes
0
answers
1k
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UFW Blocking Ethernet Connectivity?
I've isolated a connectivity issue to UFW. When I enable UFW, the connection to the web drops and I can't access the internet over it. ping 8.8.8.8 starts returning operation not permitted.
How would ...
2
votes
0
answers
162
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Ubuntu does not start / Firmware Bug
After I have installed latest updates, my system does not boot. When I turn on my laptop purple screen apears and then nothing happens. When I enter advanced options for Ubuntu I have 2 system ...
1
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0
answers
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No Wi-Fi Adapter Found in Ubuntu 18.04 - HP Pavillion x360 [duplicate]
Okay, so I've encountered yet another issue in my endeavor of "Installing Ubuntu to a brand new and clean HP System." I've tried many different potential solutions to this issue (from checking off the ...
1
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2
answers
765
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18.04 "No wifi adapter found" [duplicate]
I'm no longer able to use Wifi on my lenovo thinkpad p1 after a recent update from Ubuntu (i think at least). And I'm desperately looking for some guidance if it's the chip or if it's a driver issue.
...
1
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2
answers
5k
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Why does the common internet stop working when I connect to an OpenVPN server?
I've set up an OpenVPN daemon on an Ubuntu server of mine and as soon as I connect to it from my Ubuntu laptop with a Network Manager plug-in web pages won't open any more (but get ok as soon as I ...
0
votes
1
answer
200
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How to correct unstable wifi connection through router?
I'm using an Asus Vivobook laptop which originally comes with Win10. I installed Ubuntu 19.10 a month ago without any additional modifications.
For all these days I had no issues with my wifi ...
2
votes
1
answer
2k
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No Wi-Fi Adapter found Ubuntu 18.04.3 LTS [duplicate]
I have tried every solution that I found on internet, but none of them worked.
I am using 5.0.0-37-generic kernel and running Ubuntu from my HP Notebook 15-db1103nm Laptop
Here is my wireless info:
...
1
vote
0
answers
768
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Wifi adapter will not accept any password (Error 7)
I had to roll back my Kubuntu 19.10 from kernel 5.3.0-24-generic to 5.3.0-23-generic via
sudo apt-get purge linux-image-5.3.0-24-generic
sudo apt-get purge linux-headers-5.3.0-24-generic
because PC ...
0
votes
1
answer
283
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Netplan bridge for VMS kills internet
Here is my netplan yaml file:
network:
version: 2
renderer: NetworkManager
ethernets:
eth0:
dhcp4: true
optional: true
wifis:
wlan0:
optional: true
access-...
2
votes
1
answer
715
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Using a system with a Linux-based OS as bridge (for WIFI and ETH) [duplicate]
Context:
I have an old working system with an Ubuntu version correctly running on it.
The problem to solve:
The wifi where I work does not reach every place in the office. The idea is to use this ...
0
votes
1
answer
61
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Accessing WiFi access points Logs
i need to make a project for a client, he asked to develop a system with raspberry pi 3 to monitor search history at home routers and some other things. so my question is, do the wifi router at home ...
0
votes
1
answer
5k
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allow user to enable/disable network interface without root permission
i would like to allow a user without root permission to enable/disable a network interface from the command line, such as:
ip link set ens18 down
(ubuntu 18.04 with netplan)
i would appreciate any ...
1
vote
1
answer
579
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Why would one want to allow in an echo protocol (port 7) from host router?
I am in the process of replacing an Ubuntu server originally designed by someone else at work. I expect there will be many issues with getting Windows (and really LabVIEW) to interface with all the ...
1
vote
1
answer
302
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Once working wireless card has completely disappeard
I have been using Ubuntu for over a year now on my mid 2010 Macbook pro. I successfully installed proprietary drivers for a Broadcom wireless device and never had any issues with wifi.
After ...
0
votes
0
answers
458
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SSH Connection refused only from one computer
I'm trying to connect via SSH to an ubuntu machine that we use for computing at work.
Normally everything works fine, however yesterday I tried to setup a password-less login following this guide. In ...
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0
answers
1k
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Why I can't ping anything using this Ubuntu machine?
I am not so into Linux and I have the following problem
I have an Ubuntu 18.04 VM that is in the network of a client that is unable to perform ping.
I have tried to perform:
ping 8.8.8.8
I ...
0
votes
0
answers
37
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Trying to set up a virtual network, having issues
I'm trying to set up a small virtual network using VirtualBox but having some issues getting each VM to communicate with each other. Here's my small layout.
1 Ubuntu 18.04 Desktop VM acting as a ...
0
votes
1
answer
595
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VPN configuration with same remote and local gatway IP address
I have an issue with VPN routing when the local default gateway is the same as that on the remote network.
Here is the case config:
VPN network: 192.168.100.0/24
Remote Services network (reached ...
0
votes
1
answer
143
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Serial communication by USB cable
I am trying to make serial port communication at 115200 / 8 N with my customized hardware.
It works fine with windows as OS on PC/Laptop and teraterm as application.
The same connection misbehaves ...
23
votes
3
answers
63k
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How do I make the script to run automatically when tun0 interface up/down events?
I use VPN client to connect to my corporate servers. It creates tun0 interface after starting the client. I've written script which install specific routes point to tun0 interface and rest to use ...
1
vote
1
answer
227
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'sudo nping -xxxx' command from script. how to disable the password request from sudo
I am using the nping tool to run tests on several networks.
I also wrote some scripts to automate the parameters of such tests.
I also need to avoid sudo to ask the password every time a new instance ...
2
votes
1
answer
3k
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Communicating via a local socket or named pipe
I'm reading a book that is related SSH. I can't figure out what this sentence means.
SSH clients communicate with the agent via a local socket or named
pipe whose filename is stored in an ...
1
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1
answer
2k
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What does "sudo iw dev [interface] scan" do?
I'm having problem with my wifi adapter so I emailed customer support. The rep told me to provide him with the output for iwconfig. Then he told me to send him the output for iw dev [interface] scan.
...
1
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0
answers
388
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No WiFi Adapter Found on Dell Vostro 5481-7273 in 18.04.3
I think it is solved: I loaded the prior kernel version in GRUB, and now WiFi works fine.
I was checking emails in 18.04.3 LTS on my Dell Vostro 5481-7273 laptop and noticed a strange symbol I've ...
1
vote
2
answers
76
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Wired network interface randomly goes up
I am using desktop Ubuntu 18.04.3 LTS, I have to wired network cable connected, I am working over WIFI. But sometimes, when I work, suddenly I get annoying notification that enp108s0 interface is up ...
0
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0
answers
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Lubuntu Wireless Card firmware/driver for 32x system (Compaq Presario M2000)
First and foremost - thanks for taking a chance at reading this question. 2ndly thank you for your patience with a crayon eater such as myself. Been on windows since DOS - and am only now blindly ...
0
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1
answer
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WIFI problem UBUNTU 19.10 DELL E6430
Wifi is working great, after reboot.
Problem is when I close cover of my laptop.
After I open laptop cover again sometimes working. It's randomly
In Normal:
[ 27.129253] iwlwifi 0000:02:00.0: can'...