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.

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set netplan to use TWO static addresses preference with DHCP fallback

I am setting up a Ubuntu 22.04 server at home for use on-site. Server needs to have a static address on-site. How to test with static address at home, then take pc to site without having to change the ...
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AnyIP feature together with ndppd works on some VPS and doesn't on some others. Why?

I have VPSs mostly from the same provider but located in different places. They come with a single IPv4 and a /112 IPv6 subnet. I am trying to use AnyIP feature of Linux as described Here to make my ...
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automatically reconnect ethernet

I had some trouble with my switch hub, where ubuntu server systems are connected via ethernet. Now, i saw after solving the problem on my switch, the ubuntu servers (headless) are still disconnected. ...
Pythonaire's user avatar
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AWS EC2 Ubuntu crashing

I am using AWS EC2 with ubuntu 22. After running sudo apt-get update and sudo apt-get upgrade I have restarted the machine using sudo reboot. Then my server started crashing in every 2-3 hours. The ...
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ifconfig show unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 for usb modem

I am using Description: Ubuntu 20.04.6 LTS Release: 20.04 Codename: focal when I do ifconfig -a usb modem show following output wwan0: flags=4240<POINTOPOINT,NOARP,MULTICAST> ...
Mubashir's user avatar
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No network connection after standby or hibernation

I'm in the process of maybe dropping Windows in favour of Ubuntu and I'm going through 'that' learning process. The biggest niggle I've encountered so far concerns network state on waking from sleep ...
Chris's user avatar
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Name resolution (hostname) doesn't work /Ubuntu 22.04 server

I cannot ping or mount using hostname of server on domain network. Server is almost fresh install, just using apache, mysql, php for webhosting. If I ping server with its hostname it result with this ...
SheldonCopper's user avatar
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Issues with version control for UBUNTU 20.04 and 22.04

I have a computer that had ubuntu 20.04 installed on a Windows OS, the ubuntu 20.04 app was uninstalled, but under the Linux folder in Windows "Documents" under the Linux section there is a ...
TryingBioinformatics's user avatar
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apt-get cannot connect to Ubuntu main archives

I started my journey with apt-get update. I received error message Err:1 http://ke.archive.ubuntu.com/ubuntu focal InRelease Cannot initiate the connection to ke.archive.ubuntu.com:80 (2c0f:fe40:...
contemplator's user avatar
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Network is unreachable after move

I've got a server at home, and I've just moved. I never had problems at the old address connecting it to the internet, but at the new address, the server is refusing to connect. I've verified so far ...
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Wifi Connection does not work anymore over the night when Laptop was locked and has a low power

here is the journal of the NetworkManager: Mar 04 12:59:02 david-ThinkPad-E15-Gen-4 NetworkManager[699]: <info> [1709553542.1224] device (wlp2s0): Activation: successful, device activated. Mar ...
ddd1234's user avatar
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22.04 when upgrading the server can not make outgoing connections neither receive from vpn

After the last upgrading of a 20.04 LTS server, can not perform outgoing connections but yes incoming ones. I mean: from the LAN I can ping the server. But the server can't ping neither machines in ...
Alfons Sanchez Ferrer's user avatar
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Netplan dedicated OOB interface configuration with DHCP

I have a project that deploys virtual machines as test clients. Each VM has two NICs, one for a test environment(ens192) and one for OOB access(ens224). Both NICs get IP addresses from DHCP. Where I'...
automate's user avatar
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Web browsers can't find my certificates on Ubuntu 22.04

I've tried the following applications: Firefox (Snap) Vivaldi (DEB) Edge (Flatpak) I put the root and immediate certificate crt files in /usr/local/share/ca-certificates/, and ran update-ca-...
YamiYukiSenpai's user avatar
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Ubuntu 23.10 "Temporary failure in name resolution"

Recently my Ubuntu server has started giving me "Temporary failure in name resolution" when using ping or apt update. The server is plugged in via Ethernet and I haven't had any DNS issues ...
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ModemManager Issue with multiple WWAN Sierrawireless Ubuntu 22.04

Please let me understand the issue with multiple WWANs frequently disconnecting and reconnecting I am using Sierra wireless modems on the Ubuntu 22.04 desktop. I have updated the drivers and tried all ...
Ankur Jain's user avatar
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Internet adapter don't work properly with different subnet masks in a multi adapter PC

I'm having some troubles trying to config a triple internet adapter configuration in my 'home made NAS server', aka a old computer like a server, using Ubuntu desktop 22.04.4 with a SAMBA share for my ...
RageousRaccoon's user avatar
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Cannot access local server via Nautilus or Filezilla, but I can access it via Plex

I have an ubuntu 22.04 LTS server connected via ethernet to my wireless router, the device ip is 192.168.50.175, I can ping it from terminal and it shows up in the router map. When I remote into Plex ...
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All connections are refused from Cassandra on WSL2 ubuntu 22.04 in Windows 11

I install cassandra 4 on wsl2 ubuntu 22.04 on windows 11. Belows are the installation process. $ sudo apt update -y $ sudo apt upgrade -y $ sudo apt install apt-transport-https gnupg2 -y $ echo "...
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How to set DNS from command line on Ubuntu 20.04 Desktop?

I'm trying to set a DNS server on Ubuntu 20.04 Desktop. So far this is what I have. In /etc/systemd/resolved.conf this is the content: # This file is part of systemd. # # systemd is free software; ...
Vlad Belo's user avatar
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Ubuntu 20.04 - Browsers (Firefox & Chrome) Won't Use / Prioritize IPv4 Despite gai.conf Precedence - How can I prefer IPv4?

In /etc/gai.conf, I have the following: label ::1/128 0 label ::/0 1 label 2002::/16 2 label ::/96 3 label ::ffff:0:0/96 4 precedence ::1/128 50 precedence ::/0 ...
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How to open port on wsl2 ubuntu of windows 11

To test the network between Windows 11 localhost and WSL2 ubuntu on Windows 11, I install tomcat9 on WSL2 ubuntu $ sudo apt install tomcat9 -y $ sudo systemctl enable tomcat9 $ sudo systemctl start ...
Joseph Hwang's user avatar
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WiFi Connection interrupted spontaneously on Ubuntu 22.04

I'm experimenting with an interesting problem that started about a month or two ago. My Linux machine can read Wi-Fi signals and I can connect to my home Wi-Fi network. However, after anywhere between ...
user1282043's user avatar
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How to set static IP address on Ubuntu server 22.04 with GUI?

This is a virtual machine in VMWare ESXi 6.5. I have the GUI installed on the VM OS. I see that I should be using (according to other posts) Settings->Network. As you can see there is nothing there ...
Eric Snyder's user avatar
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Ubuntu 22.04 wifi connection is lost every x minutes

A week or two ago my wifi started losing the connection every 10-20 minutes. As far as I am aware I did not do any updates or anything prior to this. I have tried all sorts of solutions found online, ...
Drublic's user avatar
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Issue with dual-NIC clients and netplan swapping ethernet interfaces

Background: 1500+ stations running Ubuntu Server + ubuntu-desktop-minimal, most are still on 20.04, new stations are all deployed with 22.04 (with a ubuntu-desktop-minimal --no-install-recommends flag ...
SteeVee99's user avatar
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Ubuntu network mounts intermittently stop working

As the title says, some of the mounts work all the time, and some I need to do a restart for them to work. They always show they're mounted on my GUI but they do not work. Like I said, a restart ...
Mark's user avatar
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No 5Ghz detected and wifi connection "expires" but keeping a terminal pinging an address keeps the connection alive

My problem is two-fold, and I think they might be related: On the "select network" tab, I only see 2.4Ghz networks, however my router has the typical 2.4 and 5ghz variant. I much prefer the ...
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Handling DNS Resolution Failure after Releasing the Primary Public IP on Linux Machine with Multiple IPs

I am encountering an issue on my Linux machine with multiple network interfaces and IP addresses. Specifically, after releasing the primary public IP (let's call it 112. * .* .1) on the ens3 interface,...
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Wifi stutters and is slow after switching from XFCE to KDE Plasma on Ubuntu 22.04 LTS

My wifi has gotten incredibly slow with lots of what feel like stutters after switching from XFCE to KDE on Ubuntu 22.04 LTS. I confess that I don't know where to start diagnosing this issue. I've ...
jetpandas9's user avatar
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DNS Problems with Ubuntu 22.04 LTS

I have a problem to config the correct DNS. My Server receive over 700K of SMTP request daily which are using DNSBL and in some cases the DNSBL can't handle that amount of mails. I get a reason: 530 ...
Norbert Smith's user avatar
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ip addr does not chage

I am trying to change my wifi router. The old one (zz-home-tm) uses subnet 192.168.12.*, the new one (zz-home) - 192.168.0.*. At the moment both routers are running. Even if I switch to zz-home, the ...
Alex Bundy's user avatar
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wired connection stopped working

On my desktop (Ubuntu 23.10 only) I have both ethernet (Intel 211) and wireless. The ethernet connection stopped working; I can't reach the Deco router. The wireless connection works ok. The ...
JPi's user avatar
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Asking for help to troubleshoot: Networking service not starting

Since a while back my Ubuntu 23.10 (it was fresh installed) does not have a network connection on boot. After searching around for solutions I found that running systemctl start systemd-resolved....
leo's user avatar
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Ubuntu 22.04 unable to use JetBlue inflight wifi

I have Ubuntu 22.04.3 running on an Asus Zenbook, exact model UX390UAK. My wifi at home and in coffee shops works fine but on every JetBlue flight I take I'm unable to use their inflight wifi (called ...
Michoel's user avatar
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Simple eth0 config not working

I am a network guy but I am trying to set up a syslog and snmp server in gns3 using an Ubuntu appliance: Linux Toolbox-1 5.15.0-91-generic #101~20.04.1-Ubuntu SMP Thu Nov 16 14:22:28 UTC 2023 x86_64 ...
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Can't ping dynamic IPv6 Xubuntu hostname from Kubuntu laptop

Ever since I updated my computers yesterday with the latest Ubuntu updates, I have been having issues with the computers communicating with each other. Originally, nothing (Either my mobile [Android], ...
Dave's user avatar
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How can I set up socks5 proxy with authentication?

I have a socks5 proxy with user password authentication. I want to set it for my full system network traffic. How can I do that? I tried proxychain, but it only works for the command line. I need to ...
Sarowar Hosen's user avatar
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1 answer
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DNS servers and public hotspots - 25% of them fail and solution is hard to find

At about 25% of random wifi hotspots I have no trouble connecting with my phone, but my linux does not connect. I tried everything in this post. nslookup google.com does not work ➜ ~ nslookup google....
gcr's user avatar
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Ubuntu server cant ping outside network &| DNS (Temporary failure in name resolution)

My network on the server is not working, help much appreciated default via 192.168.50.1 dev eno1 proto static 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 192.168.50.0/...
fabelmk1's user avatar
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gateway is not pingable /etc/networ/interfaces

I have a raspberry pi and modem connected to the network. I add the following lines to /etc/network/interfaces source-directory /etc/network/interfaces.d/* auto eth0 iface eth0 inet static ...
Mubashir's user avatar
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Impossible to make IP static - SOLVED

I may be had an upgrade problem from Ubuntu 20.04 to 22.04 that I can't solve. My IP was before static at 192.168.0.100 on the "ens1" interface, but the interface have been set to "...
Djizuss's user avatar
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97 views

Wired Connection suddenly not working in Ubuntu 22.04

This computer is used to serve SSH remote access. The ethernet cable and network are all working fine. However, the computer has suddenly lost connection and now shows '?' sign for the wired ...
mummy's user avatar
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1 answer
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Ethernet Connection Issues 22.04 H12SSL-I

Issue Sometimes I am able to connect to ethernet briefly, but then it stops working within a few minutes, and nothing I've tried (mainly disabling and re-enabling ethernet) seems to turn it back on. ...
user3810965's user avatar
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1 answer
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Ubuntu keep disconnecting me from 5 in 5 min from any network

I keep getting disconnected (network drops) and when this happen i still see that i am connected to the network there is and its not looking like its loading or something. I tested this with hotspot ...
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How to forward internet traffic of port 51413 to go through 127.0.0.1:8443?

I am on Ubuntu 22.04 MATE. I have installed the C library of shadowsocsk-libev, and I connect to my server using ss-local -c /etc/shadowsocks.json . and I get the following output: 2024-02-13 20:38:...
zaknenou's user avatar
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NIC Bonding Problem

My infrastructure is like below: Ubuntu 22.04 LTS Server running on VirtualBox 2 NICs, enp0s3 and enp0s8, both attached to Bridged Adapter My netplan file: network: version: 2 renderer: networkd ...
NK_'s user avatar
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Can I somehow use system wide NO_PROXY to only proxy a couple specific hosts?

I know NO_PROXY is meant to be a blacklist and all other hosts are sent via proxy. But I am wondering if there is something clever I can do with wildcards and a specific couple hosts to get all hosts ...
Brian's user avatar
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pam_radius_auth: Failed to open RADIUS IPv6 socket

I am using Ubuntu22.04.3 LTS. We've encountered the following error after disabling IPv6. Previously, it was working fine when IPv6 was enabled. However, in our environment, IPv6 is not in use: "...
Ramesh Raman's user avatar
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35 views

Internet showing in visible networks but not connecting

I have Ubuntu (20.04) and I am typing this from another device.(Proving that internet is working on all my devices except on ubuntu). I have no coding experience per say but I have used the terminal ...
Saphira's user avatar

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