Questions tagged [networking]

Managing and using network connectivity on a Ubuntu system

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VPN Connection failed on Network Manager - Ubuntu Groovy - OpenVPN AWS

I am having to troubleshoot attaching OpenVPN AWS .ovpn file to my ubuntu 20.10 Network Manager. I tried troubleshooting using these articles: How can I troubleshoot “VPN Connection Failed”? VPN ...
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Destination Host Unreachable when pinging but the laptop is connected to internet and its visible to the ISP modem

I have a PC and a laptop connected to the local network. Both have Ubuntu 18.04.4 Desktop, and both are visible to the modem: But when I try to ping the laptop from the pc it says: Destination Host ...
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Problems with TPLink TL-WN823N V2 on ubuntu 20.04

I bought the wifi adapter wn823n v2 from tplink, but for some weird reason I can't install it. When I follow the instructions laid out in the installation guide, and follow the make and make clean ...
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Custom image doesn't connect to the network

A long time ago, I made this script: https://github.com/Caprice-Linux/live_image and It worked fine with Debian. A few days ago, I tested it with Ubuntu, it was really fine, but with a big problem :) ...
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Reaching a Docker environment running in VMware from LAN

Here is my setup: I have a Ubuntu 20.04.2 LTS machine running in VMware (vSphere client). On this machine, I have a local Drupal website running in Docker using Wodby Docker4Drupal https://github.com/...
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Stuck proxy settings in Ubuntu 20.04

I set proxy settings back when I was connected to the office via VPN, but they got stuck somehow and I cannot remove them. What I checked and tried: ~/.bashrc - nothing here /etc/environment - ...
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I cannot ping outside the network

I used Oracle VM VirtualBox to host a Ubuntu Server 20.04. The network is set to Bridged Adapter. sudo nano /etc/netplan/00-installer-config.yaml: network: ethernets: enp0s3: addresses: ...
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How to set up a local DNS-over-TLS service for private LAN and Android devices

Goal: Allow my Android devices to see my local LAN DNS names I'd like to set up a local DNS-over-TLS resolver (Ubuntu or RPi) to support my non-rooted Android devices to resolve my local systems. ...
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Wake On Lan not working in Ubuntu 20.04

I'm trying to set up wol on a laptop connected to a tp-link adapter by an ethernet cable. The PC that sends the magic packet is also connected to this adapter. I've already followed this to enable wol ...
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Import Windows DHCP leases into a Linux DHCP Server

I'm replacing a Windows DHCP server with an Ubuntu server. I need to migrate leases in the new DHCP. What would be the easiest solution? Create reservation in my dhcp.conf? (I would prefer have only ...
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Getting a new usb wifi dongle working, old one still works?

I am trying to get a BrosTrend ac1200 working on 20.04. Have currently been using TPlink AC1300 T4UH. The old one still works. I have had to install and re-install the drivers for the TPLink a number ...
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How to use usb.modeswtich to turn my 4G dongle from mass storage mode to modem mode?

I am a complete linux and ubuntu noob, but I can follow instructions.. I just can't find a working solution to this problem online. Everything I try doesn't really seem to work. Running Ubuntu 20.04.2 ...
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How to understand why ipsec and gre doesn't encapsulate traffic ? I wan't both

ip tunnel add ipsec0 local (my laptop after phone modem) 193.168.48.221 remote 196.196.196.20 (NordVpn server) mode gre ip link set ipsec0 up ip route add (my SPI's ip) 10.6.0.1/32 dev ipsec0 After ...
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Lenovo Legion Y530 wifi-card not detected on Ubuntu 18.04

as the title says my problem is that the wifi card is not detected and I do not know how to solve this. Here is the output of lspci -knn | grep Net -A3; rfkill list 07:00.0 Network controller [0280]: ...
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How to route from an IP in specific range to another IP in different range?

I Need to Route from an IP for example 10.4.4.5 to another IP in Different Range 10.4.6.6. How can I do This in Ubuntu? Thanks
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No Wifi after upgrade from 16.04 to 18.04

since 16.04 reached EOL I wanted to upgrade to 18.04 but after automatically restarting at the end of the upgrade, my laptop (Dell XPS 13 9360) did not connect to the internet. The wifi settings state ...
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How to make routing persistent for multiple NICs in Ubuntu Server 20.04 with netplan?

I'm trying to set up the routing for my server to different public IP addresses. The configuration of my first network works fine. The second is also configured with the right static IP after boot. I ...
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3answers
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No internet access after upgrading to lubuntu 21.04

I have upgraded my lubuntu from 20.10 to 21.04 and then I have no access to internet even though my laptop is connected to wifi. I have tried to set dns in /etc/resolv.conf but to no avail. Some ...
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On a ubuntu 18.04 with two NICs, one NIC's ip always fails to ssh the connection

There are two NICs in my VM. The os of VM is 18.04. The content of 01-network-manager-all.yaml is : it@it51:~$ cat /etc/netplan/01-network-manager-all.yaml # Let NetworkManager manage all devices on ...
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Connecting to password protected samba on Dolphin errors, `Connection to host 192.168.11.1 is broken.`

I am trying to connect to a samba. Apparently I was given a username and password, and that according to tutorials, that if I merely place this in, I should be prompted with a username and password ...
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How to stop autoconnection to usb ethernet on every reboot?

How can i stop ubuntu from trying to connect to usb ethernet on every boot . I keep removing the "automatic" connection but it always reset itself, i've tried all the commands in the other ...
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Why get I a NET::ERR_CERT_AUTHORITY_INVALID error in virtualbox guest system when i use a vpn on the host system?

When im brwosing on my virtualbox guest system (Win 10), im getting a NET::ERR_CERT_AUTHORITY_INVALID error. On my host system (Ubuntu) everything works fine. As network setting i configured NAT. I ...
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Accesing home network over Internet using my domain name with Dynamic DNS

I have a Raspberry PI with a Samba, FTP, DLNA and Webserver. I wish to access it trough ssh and web with my domain like: ssh username@my-domain.hu and like: home.my-domain.hu the problem is I do not ...
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windows laptop cant connect to ubuntu 20.04 hotspot

(my android phone can connect to the ubuntu hot-spot without any issue) when i try to connect my windows laptop to the hot-spot it says to "enter the pin from the router label". since from ...
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None of my traffic is going through openvpn. How do I solve that?

I've properly (or probably not) set up openvpn on my linux client machine. Both the server and the client can see each other. My problem is that none of the traffic, browser for example, is going ...
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3answers
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Dropbear installation in Ubuntu

I have an assignment to work with Dropbear for SSH connection. First I need to download, configure and install Dropbear. I downloaded it from https://matt.ucc.asn.au/dropbear/ I did: ./config make ...
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Bluetooth fails to connect on Xubuntu 20.04

I am trying to connect my Galaxy Buds to my XPS 9343 on Xubuntu 20.04. Using the notification area widget, I get Connection Failed: Host is down From the terminal I get Failed to connect: org.bluez....
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FileZilla slowly creeping up or down transfer rate, plus other weird behaviour

I am not sure the issue is related with my current Ubuntu, it might. I am connecting with FileZilla the present laptop, with Ubuntu 20.04, as a client, to another desktop Win 10 PC (with a USB WiFi ...
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Why aren't the stock and mainline kernels supporting Intel onboard graphics when the 20.04b kernel does? Z590 motherboard 11th gen i9 11900k

EDIT: Problem with display has been narrowed down to dual montitors. System will only boot into both monitors on the OEM kernel listed below. For ALL other kernels, including 5.12.2, and the latest ...
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iptables - help me figure out if my forwarding scheme is correct?

I want to forward everything from wlan0 to tun0, and everything from tun0 to wlan0. Using sudo iptables -S command, the output is:(assuming this is the actual rule of my iptable) -P INPUT ACCEPT -P ...
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Purge IPFS 100%

I'm trying to remove IPFS from my Ubuntu 20.04 system. I have: Removed the config files at /root/.ipfs Remove the ipfs binary at /usr/bin/local Blocked udp 4001 on iptables However, after checking ...
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Can't create 5GHz wifi Hotspot in ubuntu 20.04

My laptop's wifi adapter does support 5Ghz band I think. After viewing this post and running iwlist <interface> freq , I got wlp3s0 32 channels in total; available frequencies : ...
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Why No nic interface even if I select Network with bridged adapter in virtualbox running on mac osx?

I am trying to run vm witht he below settings for vm network. Even then when I boot into osbox image and login I do get nic interface . What should I do to get the this working ?
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How can unattended update happen when networking is disabled?

I am wondering how it is possible that my Ubuntu 18.04 system can do an unattended upgrade when shutting the system down while WiFi and networking are disabled? I had WiFi turned off and no network ...
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Network/Route only responding on primary interface

I have been trying to setup my home server with ubuntu to host webpages and other applications. Everything works fine on the local network, but when it comes to access from outside my local network, ...
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Wifi is disconnecting when a wired ethernet connection is made

I am fairly new to Ubuntu. My issue is on Ubuntu 16.04 LTS. When I boot up I can connect to wifi, which is established through the use of a USB network antenna. I am working with a slave device that I ...
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Newbie to networking and can't get new server to connect to the internet. Looking for some help

I have just taken possession of a new virtual machine that I have now installed ubunutu on. When IT gave me the details for the server, they included the below information: test.ist.berkeley.edu IN A ...
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1answer
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How can I get the Last-modified header on a https website?

I'm trying to trigger a last-modified response from a https website, but all I get is 301 Moved Permanently The above only works on websites with http and I can't figure out why it won't work for ...
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Is it possible to allow users that are not real user in a Ubuntu distro that runs the SAMBA server to access its shared-folders?

According to Samba/SambaServerGuide-->File Sharing (Basics): NOTE: the username used here should be a real user setup on your PC/Server. What if I don't have these user names created on the ...
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KVM guest bridged network not working on ubuntu 20.04

I am trying to setup a guest VM (Centos 6.3) on a ubutnu server 20.04 host. The host is a server connected via a lacp bond. On top of the lacp bond I am running a public bridge to which my VM's can ...
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1answer
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How to enable Nautilus in Ubuntu 18.04 to share a folder?

To share a folder in Nautilus, I have first installed samba via sudo apt install samba Next, I had also used synaptic to install nautilus-share (a Nautilus extension to share folder using Samba). ...
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Create a bridge between tap and ethernet interfaces

I've a (Ubuntu) Linux machine that hosts the Android emulator. I'm trying to create a bridge between an ethernet interface and a tap interface that I created. I need this tap interface to make the ...
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Confused about Linux virtual interfaces

I have some misunderstandings about Linux virtual interfaces. I managed to find which interfaces are virtual and physical : ls -l /sys/class/net/ total 0 lrwxrwxrwx 1 root root 0 Sep 30 2020 bond0 ...
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1answer
51 views

Set network interface metric to a fixed value

I have a fixed IP camera which is configured on static IP and connecting using Ethernet (enp3s0). WiFi is disabled (from the GUI). Cellular is switched on and it is also on static IP (static IP is not ...
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1answer
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StrongSwan not work with xl2tpd

I have ubuntu18 with Strongswan and xl2tpd installed. Everything is configed. I stop the strongswan by command: service strongswan stop Tnen I connect server from win97 by L2TP. It works fine. however,...
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Dual band WiFi adapter can only connect to 2.4ghz networks

I followed this guide to install the drivers, I thought everything was working fine for a few days but then I realized that I am unable to connect to 5ghz networks.The WiFi interface in question is a ...
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Identifying Chrome-gn

Recently I was auditing my Ubuntu 20.04.2 system and ran this command: lsof -i -P -n | grep -v "(ESTABLISHED)" The output of that command is shown below: chrome-gn 5603 alkphekka 137u ...
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1answer
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How do I create a wireless access point using only one wireless NIC but 2 different SSID:s?

I would like to create a wireless access point using only one wireless NIC but having 2 different SSID:s, is this even possible? It would be perfect if clients connecting to the different SSID:s also ...
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What Ubuntu component is taking down my IPv4LL and how do I stop it?

I have a workstation running Ubuntu 20.04 LTS. I plug an embedded-linux device into it ethernet-port-to-ethernet-port and they are supposed to self-assign IPv4 addresses (although I have to use Linux ...
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Auto Startup Remmina is not working perfectly

I am using Remmina for remote access. Now, the problem is, at the very first time, I need to log in to my remote pc physically, and then I can access it from my client pc. More clearly, I already ...