Questions tagged [networking]

Managing and using network connectivity on a Ubuntu system

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Ubuntu 16.04 Ethernet connected but no internet access

I have an ubuntu device that is connected to ethernet "eth0" but no internet access. below is the output for nmcli device show eth0 GENERAL.DEVICE: eth0 GENERAL.TYPE: ...
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How to auto switch to preferred wireless network

I have two wireless networks (fiber router & phone). I want to Set the Router wireless as primary When the primary network is off(Power failure) autoswitch to secondary. When the primary network ...
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ConnectionRefusedError: [Errno 111] Connection refused

Executive Summary. I get "connection refused 111" when trying to communicate over sockets in Python. When the connection is refused, THE LISTENER STOPS LISTENING. Same problem occurs using ...
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Fixed address on DHCP server isn't working

I'm running Ubuntu 20.04 as a DHCP server and I tried to assign a fixed address to a client which is another Ubuntu os on a Virtual box, and both of them are in the same internal network, but, it ...
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Can't connect any outside host (using ipv4 and tcp)

Using Ubuntu Server 20.04.2 (LTS) as a template in VMWare Cloud Director. Basically I can reach I can reach any host in my subnet 10.16.0/24, when it comes to connecting thru the gateway at 10.16.0.1 ...
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iptables - firewall configuration - Ubuntu Script 18.04

I need help with configurating iptables. I've made some progress which i think might work like, but i'm not sure. Looks like this: #!/bin/bash #changes NET="10.10.10.0" ADMIN="10.10....
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wireguard no handshake and no ping. Firewall is inactive

wg show command on server: > interface: wg5000 > public key: ************************** > private key: (hidden) > listening port: 51824 > peer: ************************...
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guess ethernet interface is bounding, where would I find a log that proves or disproves

I have a program that is sensitive to ethernet interface changes or bouncing on and off. The program in question is a monster (microk8s), so it could be failing for other reasons. Also, on occasion, ...
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ASUS USB-AC53 Nano on Ubuntu 20.04, is recognized, but cannot connect, keeps asking for password

I have bought ASUS USB-AC53 Nano wifi adapter, and am trying to make it work on Ubuntu. So far I have tried all possible steps I found on the google. I have used drivers from these repos: https://...
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Issues with Netplan - Static IP

With the release of Ubuntu Server 20.04 I've had some weird issues concerning Netplan. I'm a student so I use Ubuntu Server as a virtual machine and I have to move a lot (which means, changing IPs all ...
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OpenvSwitch trunk to real switch

I tried to configure a trunk interface on OVS with a real switch but it doesn't work and I don't know why.. OVS configuration : ovs-vsctl add-port br0 eno2 vlan_mode=trunk tag=4002 ovs-vsctl add-port ...
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Access point incl subnet

I’m running Ubuntu 20:04 on nuc. I know how to make a access point via settings and it works but can I run a “guest” subnet on the same WiFi card at the same time ? I will have one subnet 192.168.1.x ...
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Internet is getting disconnected frequently for Ubuntu VM

After Reading so many articles and posts , I am still not able to solve the problem of internet dis-connectivity inside my Ubuntu VM . I am using following tools : 1: Windows 10 host machine 2: Oracle ...
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How to disable connection reset on DHCP Timeout?

Have a shiny new Latitude running Ubuntu 18.04 with all the updates. I'm trying to replicate a network manager config that I have working on CentOS 7 and Debian where I have one Untagged and several ...
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Network Size is 100Mbit/s, but my capacity is 1Gbit/s. I have I219-V Ethernet connection

My Network size is 100Mbit/s, and i wanna change it to 1Gbit/s, because my capacity is 1Gbit/s. *-network description: Ethernet interface product: Ethernet Connection ...
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can not access USB shared drive from Ubuntu to Ubuntu 20.04

I need help with the following problem: I can not access a shared external USB drive from one Ubuntu machine to another Ubuntu machine. Machine 1 = Raspberry Pi 4 with Ubuntu 20.04 (new installation) ...
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SSL certificate only works on a port

I use an SSL certificate from Letsencrypt and this worked for me forever. Today an error has occurred that the SSL certificate is not secure. I use webmin as Control Panel and when I access webmin ...
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47 views

Why do i get awful network speeds on Ubuntu 20.04 when they were fine on Windows 10? Is it a driver issue?

I recently switched to Ubuntu 20.04 from Windows 10 on my Lenovo B50-45 with a Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter (rev 30). My Network speeds have always been normal on Windows ...
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Logging the total bandwidth of a process

I've got a fairly small monthly bandwidth cap on my VPS, so I want to monitor exactly where that usage is coming from. After searching around, every tool or guide I find seems to only be realtime ...
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29 views

Bitmeter started on server, can't connect remotely

I installed Bitmeter on Ubuntu server and followed the instructions in the FAQ. I Issued bmdb webremoteadmin and sudo bmdb webstart and both command seems successful but It will give an empty response:...
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UFW status is getting problem running iptables

I want to use UFW (version 0.36) but I get this error when running ufw status: ERROR: problem running iptables: Another app is currently holding the xtables lock. Perhaps you want to use the -w option?...
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USB Ethernet adapter randomly disconnecting and reconnecting

USB Ethernet adapter randomly disconnecting and reconnecting I have a USB adapter that works well on a windows machine, but I tried everything to make it work well on Linux. It disconnects, but the ...
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66 views

Two WiFi Cards/Adapters

I have two WiFi cards connected to my computer but I want to be able to switch between them. When I run lspci | grep Network I see the following: lspci | grep Network 01:00.0 Network controller: Intel ...
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How to start wifi in Recovery - 20.04

Computer boots, goes to grub but ends up stalled on the "/dev/sda1: Clean" page and won't advance. If I choose recovery mode, there are some commands I could use IF I have wifi. But if I ...
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Problem installing mavlink-router for nano pi neo with Ubuntu 16.04.2 LTS

I am a total newb at Mavlink. I follow the installation procedure on the following page https://github.com/mavlink-router/mavlink-router. Using the command $ git submodule update --init --recursive, I ...
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How to assign the same static IP to a wired and wireless NIC?

I have a machine (18.04, will be 20.04 at some point) that has a wired NIC as well as a USB card with a wireless one. It is usually connected by cable, but sometimes the cable is disconnected (...
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Airties 2610 Wifi USB Adapter Not Working

I am new to Linux and Ubuntu. I have the ver 20.1 Ubuntu installed. Got almost everything working except the Wifi connection. I have Airties 2610 USB as adapter. There is no linux driver on the ...
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What is the relation between web server like “apache2” and this user www-data? [duplicate]

What is the relation with this user www-data and web server like apache2?
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Run an SSH command at shutdown using systemd

I need to run an ssh command at shutdown/reboot in my Ubuntu 18.04 PC I struggled reading infinite posts pretending to solve this issue but no way. I wrote this service in /etc/systemd/system/mydown....
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Wi-Fi router gateway IP adding as nameserver IP in resolv.conf only works for Pulse secure VPN connectivity

I am using Ubuntu 18.04.5 LTS and trying to connect Pulse secure VPN with default nameserver entries in below resolv.conf file, but unable to connect, it gets connected for second or 2 seconds and ...
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Can't reach gateway ubuntu 16.04.5

I got virtual machine with Ubuntu 16.04 there was performed command chmod -R 777 /. My task is to recover system and reach the internet. My steps where this: I entered recovery mode and did this Fix ...
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Continuous “Temporary failure resolving repositories”

Since I moved country (i.e. to say different location, new network, etc. but same machine) I have problems updating the package list. It does not matter if I run sudo apt-get update or sudo apt update ...
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routing between vmware nat and physical interface

I have my ubuntu box with ip is 192.168.0.31 and macbook laptop whose ip is 192.168.0.111 I installed vmware workstation on ubuntu which created additional virtual interfaces. All VMs in my vmware ...
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Ubuntu 20.10 Server on raspberry pi 4 won't see a network

So I have been trying to set up a WordPress site on Ubuntu 20.10 on a Raspberry Pi 4, and have messed up Configuration files, and other settings on many occasions. So I've flashed my SD card (used as ...
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Ubuntu Server 20.04.02 not starting eth0 at boot

Running Ubuntu Server on Windows Hyper-V. Rebooted the VM after Docker was giving me some issues. I can start the interface manually but anything I've tried to automate the interface up on boot does ...
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Cannot connect to Internet over Ethernet

I recently upgraded to Ubuntu 20.04 from 18.04, and my Ethernet connection is not working. When I was using 18.04 everything was working fine but since the upgrade I can't get a wired connection to ...
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38 views

How to sandbox/VM a VPN to be used by a single application?

I have a remote server running Ubuntu 20.04 LTS (headless). I want to use an enterprise VPN client (GlobalProtect) to have the server tunnel into another network for a single application, but the ...
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162 views

Laptop cannot connect to the specific router

My laptop cannot connect to the specific router (it works when I switch to Windows with the same machine, it works with other routers, other devices can connect to this router as well). What could be ...
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Mount LAN resource at system start

This is My first post. Sorry My bad English. I only speak spanish. I need to Mount a lan folder in My local computer. I do that with this command: sudo mount -t cifs //192.168.X.X/MUSICA -o username=...
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95 views

Intermittent failure of Wifi on Ubuntu 20.04

I'm on an Asus TUF A15 running Ubuntu 20.04. The Wifi occasionally disconnects. It will show that it's connected to the router, but the network manager tray icon will just show a question mark and I'...
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There is internet on Ubuntu Server but not in Client

I am so sorry if this questions repeated so much but i will go crazy. It will be a bit long and sorry for that! Lately I have a work in systems administration and I have to create a Ubuntu Server and ...
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Wireguard : ping from server to client doesn't work without adding endpoint in the peer section. What could be going wrong?

I have a wireguard configuration; client is a server on digital ocean and server is somewhere else. Not in digital ocean. I have the below wireguard config for server and client: Server side: [...
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1answer
60 views

netplan isnt being applied and i am not getting an error message when i try to apply it

ive been trying to setup my 20.04 ubuntu server and get it connected to the internet through wifi, ive been following this website https://linuxconfig.org/ubuntu-20-04-connect-to-wifi-from-command-...
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accidentally modified /etc/resolv.conf and now cannot acces the Internet

I'm using ubuntu 18.04 on my dell inspiron 5402.I was annoyed about frequently getting a question mark on that wifi icon,so I followed some method on the Internet and unfortunately got this problem. ...
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33 views

After uninstalling Samba, can no longer access Windows network

Ubuntu 20.04; local network with one Windows 7 and one Windows 8 machine, on a workgroup I recently did a fresh install of Ubuntu 20.04. At first I was able to see the Windows network and access the ...
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138 views

r8125 PCIe card not working with 20.04.2 / kernel 5.9 / Gigabyte B550M-DS3H

I am attempting to upgrade my home network to 2.5 Gbps ethernet using r8125 PCIe cards (Cudy). After considerable troubleshooting effort and research, I am unable to get this working on this machine. ...
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41 views

Unable to access the internet from one server in an Internal Network through a proxy server with NAT enabled

I've created a small virtual network on Virtualbox with three Ubuntu 18.04 servers: Server1, Server2, Server3, which I plan to expand as my learning progresses: All three servers are able to ...
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20 views

Bluetooth adapter missing after every shut down

I have installed the bluetooth driver for Ralink RT3290 and it works perfectly. But every time I start my machine up again, blueman complains that the bluetooth adapter is missing. rfkill doesn't ...
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21 views

Use Ubuntu server to access remote site

I saw related posts, but I need specific help because I can't solve this problem by myself. Google Cloud Platform. A Ubuntu server with Strongswan installed and a virtual ethernet adapter. And SNAT ...
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1answer
68 views

Ubuntu server 20.04 IPv6 DUID

on an Ubuntu server acting as an DHCPv6 client with netplan set like this renderer: networkd dhcp6: true I received an IPv6 address but I need the DUID to create a static lease on a router. I did a ...

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