Questions tagged [networking]

Managing and using network connectivity on a Ubuntu system

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Ubuntu 20.04 LTS lan network problem

I have duel boot desktop system Window and Ubuntu. I deleted Ubuntu 18.04 LTS which was working fine and installed (not upgraded) to Ubuntu 20.04 LTS. Everything was fine but later I got several ...
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Warning: iptables-legacy tables present

I have migrated my Ubuntu Focal server firewall backend from legacy iptables to netfilter, by running update-alternatives --set iptables /usr/sbin/iptables-nft and rebooting the server. Now all tables ...
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Cannot access apache from lan computer when server has static IP

I started with a fresh build of 20.04 with static IP. Updates done. No firewall enabled. Apache2 installed. I cannot access the apache site from a remote computer on the lan, only the server, either ...
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Ubuntu not recognising only my home WiFi

Like, the Wifi adapter is finding all wifi except my home router. I tried connecting through the hidden connections. Restarted the laptop. Recently I installed NPM, OQASP JUICE SHOP, DVWA, Google ...
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Ethernet is always down after reinstalling python3

Background I was working on a python module and couldn't understand why it kept throwing an error, so I very intelligently decided to just uninstall then reinstall python3, nothing could go wrong, ...
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Ubuntu20.04 not use network(both wired and wireless)

My ubuntu20.04 can't connect to the network after boot, can search the relevant network card information, later I decided to use the mobile phone USB sharing, but still can't, and then I decided to ...
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Network manager keeps changing default route (eth1 / wlan0)

I use integrated wlan card on laptop, and at work I dock my laptop on a thunderbolt 3 connection. After I have docked my laptop, the route table changes metrics a few times (for a good 20 mins in this ...
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Need a step by step guide to create a working BIND9 DNS server using only the terminal [duplicate]

I'm a freshman in Computer Science and just got assigned a task from the title. The problem is that the teacher told us nothing about how to do it. He spent 8 hours showing us how to create ...
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Ubuntu 20.04. laptop closed lid issue

I am solving a minor issue with my Ubuntu 20.04. Focal fossa. This might be relevant for all users using a laptop closed aside with an external display. Whenever I shutdown or reboot the computer (...
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WiFi connected, but no Internet - MacBookPro

Since I'm inexperienced with Linux I could only so much based on what I looked for on the Internet. Basically my Mac connects to the home's WiFi, gets IP and everything it needs and... No internet as ...
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“No Wi-Fi Adapter Found” on Ubuntu 18.04 Lenovo Thinkpad T470

On clicking the Wifi settings, its showing "No Wi-Fi Adapter Found". I referred many pages and tried the steps to install the Github drivers, but no luck. Please refer below the details of ...
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Wireguard handshake works but no internet access

First off: this is not a duplicate. I've tried everything except OpenVPN or IPSec. I'm receiving a handshake between the client and server, and SSH and Ping work between clients, but I cannot access ...
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Ubuntu mate 20.04 not showing networks

Switched to Ubuntu mate and no WiFi networks are shown. No Ethernet shown either
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Realtek 8812AU / 8821AU wireless driver for Ubuntu 20.10

I have little linux experience and am wondering if anyone can help me with this? I have a Realtek 8812AU / 8821AU USB wifi dongle and am needing the drivers for it so I don't have to be tethered to my ...
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Route VLAN to external VPN server on Ubuntu router

I’ve subscribed to a VPN service (vpn.ac) and I would like to route a specific VLAN to that server so that I don’t need a VPN client on the device (specifically I would like my Nvidia Shield android ...
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Wifi disconnects and reconnects on its own frequently on Ubuntu 20.04 LTS

I am using Ubuntu20.04 LTS for sometimes by dual boot on my Dell Inspiron 5559 and I use TP-Link router. I use wifi without any problem in my Windows 10 os. But on Ubuntu the connection disconnects on ...
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Ethernet Cable Unplugged in Ubuntu 20.04 while it works in Windows

Sorry but I am no linux expert what so ever. I just bought a new motherboard; ASUS ROG Strix B550-f Gaming (Wifi) and I'm having trouble with both wifi and ethernet in Ubuntu 20.04. I have both Ubuntu ...
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Wakeonlan only works 5 seconds after shutdown

Any help would be appreciated, I had WOL working on my previous sytem and really would like it to function again. I'm using Kubuntu 20.04 LTS. I viewed other threads with no solution applied to me ...
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ssh localhost: Permission denied (publickey) Ubuntu on WSL2

I'm having trouble "sshing" to localhost and getting a permission denied. I have tried everything from root or using sudo as well. I'm having trouble "sshing" to localhost and ...
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No Wi-Fi Adapter Found Ubuntu 20.04

System: Dell Precision T3400 dual-boot Windows 10/Ubuntu. The system is connected via Ethernet to the internet at the moment. After update to Ubuntu 20.04 I am experiencing "No Wi-Fi Adapter ...
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How do I install driver on my Alfa AWUS036NEH?

The CD-ROM that came with it doesn't really give me answers on how to install the driver on the WiFi antenna I want to download a driver so it can run on Linux Thanks in advance
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Connected to internet, but unable to access services

I can connect to the internet and do upgrades on the machine itself, but I am unable to access ssh, or a webpage installed as well as not being able to access a Minecraft server that is installed on ...
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Cannot access website running on Apache2 server

I have an Apache2 server on Ubuntu 20.04 running a website on 192.168.0.20. So I tried wget 192.168.0.20 on another machine with ip address 192.168.0.19 which worked fine. My problem is that I can't ...
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Wifi adapter not found and i dont have ethernet port

I have HP Pavilion x360 - 14m-dh0001dx and i recently installed ubuntu 20.04 lts. And my wifi is not showing. Ps my laptop doesn't have a built in ethernet port. Any solutions? the output of lspci -...
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Can not open sites using wireguard VPN

I'm trying to setup wireguard VPN in Ubuntu 20.04. I do the following: sudo cp wgIoffeVPN2smirnovdm.conf /etc/wireguard/wg0.conf sudo wg-quick up wg0 [#] ip link add wg0 type wireguard [#] wg setconf ...
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Problem with mode switching for usb modem

THis problem is related to Problem with using 4G modem In short, I have used another dongle that I can find DWN-222 Dlink dongle which works on my other setup (raspberry-pi buster) The current setup i ...
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Firefox/Chrome, how to whitelist localhost and wikipedia.org?

On Firefox and Chrome, how do I allow the local network and Wikipedia (localhost, 192.168.1.*, *.wikipedia.org, etc) but block everything else? A whitelist essentially. I still however want other ...
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Ubuntu 20.10 network operations from Terminal

I have already looked around but I always find different answers. I would like to know the terminal commands in Ubuntu Desktop for: start/stop/restart the network enable DHCP/IP Static thanks
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Can't connect to the internet. “Wired Connected” but internet not working

The only thing I see is this in the syslog: Note: writing this from a laptop so I can't copy-paste. org.gnome.Shell.desktop[1844]: some more numbers ERROR:connection_factory_impl.cc(428) Failed to ...
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Can't find the name of wireless interface after installing Ubuntu 20.04

I'm following this tutorial in attampt to connect my laptop to WIFI after installing Ubuntu 20.04 LTS. However, I run iwconfig in the terminal and it only returns: lo no wireless extensions. ...
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Wifi issues old Zotac Motherboard

I have recently freshly installed Lubuntu 20.10 onto an old PC I had lying around. It has a Zotac-h67-C-E motherboard and I'm having some issues with the onboard wifi (rt2800pci chipset). At startup ...
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Why is iptables -F kicking me out of my ssh session?

I wanted to add some rules to iptables from this question and answers to route traffic from torrent programm Transmission through a vpn (surfshark in my case). At least two of the answers use iptables ...
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Can't update my Ubuntu Oracle instance - Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)

I've done some reading on similar errors and I tried the suggestions but they did not work for me. My current setup is using Unbound as a recursive DNS server and I don't know if that affects the ...
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Unable to get out to the internet on Ubuntu 18.04

I'm using wifi and it shows that I am connected to my home network but i am unable to get out to the internet. What is strange is if I connect to my iPhone hotspot I can connect without any issues. I ...
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connect to vpn in ubuntu 20.04 problem

I have VPS windows server that have VPN enabled on. I'm already connected to that VPN with android phone and windows10. but i want to connect to that with Ubuntu 20.04 and get "connection failed&...
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Routing through 3 subnets

I'm planning on setting up a remote backupserver and need to route my traffic through OpenVPN through three subnets. The setup will look as follows: OpenVPN Server (Debian) if01 - 192.168.2.31/24 (...
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Ubuntu 20.10 No SSID in Wifi Scan

I have an usb dongle realtek 8188eu .I installed it from git. then wifi appears in gnome. but there is no ssid while it was scaning. *-network ETKİSİZLEŞTİRİLDİ açıklama: Kablosuz arayüz ...
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Internet connection lost until network reset

I've been having issues with my internet connection, but only when the internet signal itself is somewhat weaker. I have this on plain Ubuntu 20.04, Linux Mint 20 and PopOS ( haven't tried any others )...
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Ubuntu samba share strange permissions on directories drwxrwsr-x

I have strange permission on my samba server. smb.conf [share] path=/samba/share valid users = admin share @share writable = yes browseable = yes read only = no security = user netbios name = FFshare ...
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Have 2 unknown smb network shares on my ubuntu machine

today I noticed something strange about my machine, it has the following two smb shares that I have never seen before, is this a normal behavior? I been trying to get rid of them but no luck. PLEASE ...
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Intercepting PHP traffic

I would like to know how feasible it is (and then the ability to stop) someone running malicious code on a Ubuntu server that reads the data sent to, and handled by PHP (I am using the apache module ...
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Cloud-init error and no network on ubuntu server VM

A VM on VirtualBox with recommended configuration and Ubuntu 20.04.1 This machine has only a few weeks, I just install netplan and isc-dhcp-server and all the configuration was correct and running for ...
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Dell XPS 15 - Problem with Wifi (Eduoram)

I've recently installed Ubuntu on my Dell XPS 15 and after a lot of troubleshooting I've got it working. I'm using Ubuntu 20.04.1 LTS x86_64 My problem is that i'm experiencing it dropping the wifi at ...
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ubuntu 18.04 ISO - Disable Network Configuration Prompts / Dialog via preseed config

During ubuntu iso 18.04 server install the network configuration manager dialog will showing if ethernet is not active. Note: I have created unattended ubuntu 18.04 offline iso. hence I don't want to ...
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How can I view user search history on my network using linux??? still new to everything thanks in advance

How can i view search history of user on my network i saw someone do it before and just want to know how. any help would be appreciated, just so you know i'm using linux and i did the if configuration ...
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How to set and configure server WWW with apache2 (Ubuntu 16.04)

So, I've been said to set and configure virtual WWW server on virtualbox, where one machine is a server and 2nd is the client. Server has 2 internet cards, where client only one. Server's first card ...
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I have to type in port 80 after my website to see it (www.example.com:80 - but only with ssl)

I am new to server management and decided to learn by deploying my own website :D The problem is probably that I misconfigured iptables / didn't configure them enough. I have a node app running on ...
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Seeing huge increase in ssh bruteforce attacks from mass of IPs. Am I being specifically targeted?

I am suddenly seeing a mass of bruteforce ssh attacks on my personal server. I am using fail2ban, and the attacks are causing fail2ban to have significant CPU load just to keep up with the banning. ...
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How to SSH to multiple servers in one tab in Guake [closed]

I work as a technical operator in a company that provides people with Internet access and at work we connect to different vlan machines using SSH in guake terminal. We connect to each vlan machine in ...
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SSH connection refused to Ubuntu Virtual Machine

I am using a windows 10 machine(corporate), firewall is turned off. I have installed Ubuntu on my VMWare VM and setup openssh-server. I also did: sudo netstat -tupan to see if my ssh daemon is ...

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