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.
11,167
questions with no upvoted or accepted answers
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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. ...
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155
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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> ...
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34
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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 ...
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171
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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 ...
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2
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119
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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 ...
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74
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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:...
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46
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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 ...
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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 ...
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31
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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'...
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45
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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-...
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90
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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 ...
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23
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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 ...
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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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36
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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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315
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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; ...
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51
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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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108
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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 ...
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1
answer
195
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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 ...
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106
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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 ...
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84
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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, ...
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56
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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 ...
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1
answer
85
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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 ...
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28
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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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66
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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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26
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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 ...
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71
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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 ...
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1
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34
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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 ...
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74
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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 ...
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43
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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....
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50
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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 ...
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27
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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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1
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54
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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], ...
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117
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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 ...
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1
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57
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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....
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69
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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/...
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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
...
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62
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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 "...
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97
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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 ...
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1
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37
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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.
...
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106
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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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27
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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:...
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71
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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
...
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23
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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 ...
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40
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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:
"...
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35
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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 ...