Questions tagged [networking]

Managing and using network connectivity on a Ubuntu system

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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 ...
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First Computer class and I am struggling, this is what I have so far. It's not working and I have no clue what to add to make it better [closed]

Please help :( I have no idea what i'm doing 1 start() 2 { 3 brand=$(zenity --entry --text "What is the brand of skate you are intersted in(moxi, impala, bont, chaya)?" --entry-text "brand") ...
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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 ...
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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 ...
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Anbox has no Internet Connection

I installed Anbox, it does install uninstall apps fine,but there is no internet connection inside Anbox. Version: Latest stable version Version from terminal Android settings inside Anbox In ...
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Kubuntu 19.10 iwlwifi error causing system hang

From today my Kubuntu 19.10 system is hanging when it tries to connect to wifi. At the boot time it shows this error : iwlwifi 0000:03:00.0: Direct firmware load for iwl-dbg-cfg.ini failed with ...
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SSH works only within LAN and not remotely

I have tried pretty much everything. Configuring my firewall to allow all tcp packets in: sudo iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ...
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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&...
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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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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=...
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After taking an Upgrade, I've lost NW Access and my CD-Rom Drive won't open…so can't rebuild..Help? [closed]

I'm new to UBUNTU...so be gentle with me...Things went downhill fast after I ran sudo apt upgrade ......Apparently the NIC is no longer recognised...neither is my Broadcom Wireless Adapter....so I ...
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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 ...
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Rsync to SMB Share Stops

I have 50GB of files on an external drive. I'm trying to use rsync to push from the external drive to an SMB Share on a QNAP NAS. I'm having two problems: 1) After x period of time, it just stops (...
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Hotspot login: Error receiving data: Connection reset by peer

I just opened my laptop and I received this message Error receiving data: Connection reset by peer from a window named "Hotspot login" and the WiFi logo appears to have a questioning mark on it. ...
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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....
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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-...
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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 ...
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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 ...
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Multicast not working on second vlan

I have Ubuntu 18.04 installed on my workstation with one NIC. On my network adapter eno1 I had setup eno1.201 and can see my multicast working fine with VLC.. When I change it to eno1.202, I can ping ...
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Need help installing rtl88x2BU_WiFi_linux_v5.2.4.4_25643.20171212_COEX20171012-5044

Have ubuntu 19.10 on a system with an onboard 100mbps wireless adapter. Recently upgraded my broadband service to gigabit fiber. I bought a usb wifi adapter to take advantage of higher speeds. I have ...
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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/...
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can't make wired connection while trying to install

I'm trying to install ubuntu 18.04 on an intel NUC8i3BEH. While running ubuntu from the USB stick it's unable to make a wired connection. I tried changing the line in /etc/NetworkManager/...
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how to set up a L2TP server to pass static public ip direct so no nat instead of a local ip

how to set up a L2TP server to pass static public ip direct so no nat instead of a local ip so that i can host the server in a vps and run a l2tp tunnel to a router that is behind cgnat to allow it to ...
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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: ...
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TL-WN722N V3 Drivers Ubuntu 16.04

I bought TL-WN722N V3 USB Adapter and I followed the installation guide PDF for Ubuntu 16.04 on its page. Nevertheless, after using the command make, I have the following errors: > make ARCH=...
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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 ...
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MSI laptop WiFi fails in Ubuntu 18 LTS AOK in Windows 10

I've added dual boot with Ubuntu 18.04 LTS to the original Windows 10 , and all runs good. But, in Ubuntu my laptop (an MSI Prestige 15) doesn't detect the WiFi adapter, so i cant connect to the ...
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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 ...
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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 ...
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How to block all outgoing traffic on network except process

I want to block all outgoing network except process. How can i do that ? The ufw doesn't provide process base rules. Iptables allow some rules about gid-owner ... but not process. for example can ...
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1answer
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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 ...
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Configure netplan for multipath

I have a modified version of iproute2 (the one given with MPTCP) that supports the command ip link set dev ethX multipath on to enable MPTCP on the interface. How can I set this option in netplan's ...
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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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WiFi No Longer Authenticating Kubutu 18.04 wlp59s0: Link Not Ready

I was hoping that the community could help me with a problem that has developed overnight on my Dell Precision 5630 laptop which is running Kubuntu 18.04 LTS. Everything had been running fine since ...
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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 ...
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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 ...
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WIFI works for 30 seconds then all available networks disappear

When I first boot up, all the available wifi networks are listed. I try to connect but after a few seconds all the wifi networks disappear and wont connect. I renamed one of the wifi networks and ...
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Ubuntu 18.04 workstation access to samba server became read only

I believe after power failure access to samba server became read only. I can read files from the server (FreeNAS 11), but when I try to modify files residing on the server for example using open ...
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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 ...
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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-...
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Wifi adapter not found, But bluetooth is found & working (Dell XPS 9570 - Killer 1650 - Ubuntu 19.10 - krnl 5.3.0.23)

I've got a lot of similarities as the post here. But it did not resolve my case. I am still a noob with Linux so bear with me. TL;TR of other post: My WiFi adapter is not recognized by the OS. But ...
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REALTEK RTL8187 Wireless LAN Driver and Ubuntu 19.10

Old problem in the new operating system: I have an ASUS motherboard with a built-in wi-fi card, the operating system is Ubuntu 19.10, all network drivers are standard periodically, the connection to ...
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2answers
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What does mean DORMANT mode in ip link show wlan0?

As the title above, does anyone know what DORMANT mean in this output command ? $ ip link show wlan0 3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group ...
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VPN with RSA SecurID

Issue, I tried setup and connect to VPN with SecurID, but nothing happened. I have this information about VPN. authentication method: SecurID; SecurID authentication: PinPad. Question, is possible ...
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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 ...
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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 ...
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1answer
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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 ...
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1answer
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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 ...
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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. ...
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Rpi 4 with Ubuntu Server tether network with usb-c

I have a Raspberry Pi 4 4GB were I have installed Ubuntu Server 19.10, I'm trying to get network and power over a USB-C cable to an Ipad Pro. I follwed this tutorial to get it working with Raspian ...