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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Multipathing support

I have 2 nics in ubuntu server, say for e,g NIC1 and NIC2. These are intended to serve netapp storage traffic simultaneously using iscsi . Multipathing is enabled. When we issue the multipath -ll, i ...
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Yet another issue with the RTL8821ce wifi card from Realtek

I have encountered numerous issues with the rtl8821ce WiFi card on almost all Linux distros I have tried (including ChromeOS Flex), except for Arch Linux and EndeavourOS. Here is a snippet from sudo ...
5 votes
2 answers
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Is there a GUI app to setup and toggle hostapd?

Title says it all, I've tried wifi-hostapd-app but I always run into trouble while installing one of its dependencies, dnsmasq specifically. I read one of the workarounds is to disable Ubuntu's ...
0 votes
1 answer
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Launching ProtonVPN On Ubuntu 22.04 Error - AttributeError: 'NoneType' object has no attribute 'connect'

I am facing this issue using ProtonVPN on Ubuntu, it was working well a few days ago. I have also tried to reinstall it several times but nothing seems to work. Please if anyone got this before, here'...
-2 votes
1 answer
19 views

Its about snort , where i cant run the snort.conf and showing there is no such file or directory. How to solve that issue?

the image is a snippet of vmware virtual machine where I have found a problem of a snort networking ## Heading ## the image is a snippet of vmware virtual machine where I have found a problem of a ...
0 votes
0 answers
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loosing internet connectivity after some time in ubuntu 22.04 running with low latency kernel

I have 5 interfaces on this system enp1s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 9000 inet 192.168.20.2 netmask 255.255.255.0 broadcast 192.168.20.255 inet6 fe80::b37:905f:...
-1 votes
1 answer
28 views

Sudden problem with WiFi internet access with one specific Ubuntu 22.04 device with one specific router

I have an Ubuntu 22.04.4 LTS (with Intel Wi-Fi 6 AX201) that suddenly it just can't access the internet with my home WiFi. It was completely unexpected because it was working fine up until now, and ...
-1 votes
0 answers
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Unable to send email out on port 25 which was previously working

Hello I am having issue sending mail from my own hosted mail server. I has worked fine for a long time. A few days ago I added DKIM using an online guide, everything seemed fine at first. About 18 ...
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Latency issues on KVM VM and kernel 6+

I'm running virtualization on Ubuntu 22.04lts host and when upgrading the kernel to 6.* we start to have issues with latency on the VM machine(qemu+libvirt). The moment I roll back to kernel 5.15 on ...
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LAN network with just two computer: All ports time out, except port 50002, which refuses connection. Why?

Preface and Context: I am currently troubleshooting the ROS2/LAN based connection of my UR5 CB3 robotic arm with the Ubunut 22 control comupter and the respective driver. This robotic arm seems to ...
-2 votes
0 answers
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I am unable to access the internet

So... I recently installed Ubuntu on one of my old PCs out of curiosity, and it was working well. My PC doesn't have an in-built wi-fi adapter so I use a USB one, and since wi-fi was slow anyways, I ...
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Ubuntu Server LTS 22.04.4 has internet connection, but is not visible on router's device list

I have a fresh install of Ubuntu Server 22.04.4 LTS on an old mini-pc I got from work. I want to run a network share, a vpn and some other services on it and in order to get them working reliably I ...
-2 votes
0 answers
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Internet connection problem with Ubuntu 22 - SOLVED

I have a dual book Surface pro 7 with Windows 10 and Ubuntu 22 installed. I can get out on Internet with Windows and also with my sgin Android pad. But not with my Ubuntu 22. With Ubuntu I get a ...
0 votes
0 answers
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Ubuntu Server on Raspberry Pi 5 is not connecting to the internet

Ubuntu Server on Raspberry Pi 5 is not connecting to the internet. Images of the errors: I tried reinstalling it at least 5 times: Ubuntu server on Pi won’t connect to Internet more insight hope ...
0 votes
1 answer
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ip-config-unavailable DHCP error from NetworkManager

Overview and Environment I recently set up a new VirtualBox VM and ran into some strange network behavior. The machine is running Ubuntu 22.04 and after installing the virtualbox guest additions, my I ...
0 votes
1 answer
4k views

Temporary failure in (DNS) Name Resolution / 20.04

"Temporary failure in (DNS) Name Resolution" Background: I work in healthcare security with approximately ~125 servers across a dozen clients across the US The appliances are both physical ...
2 votes
1 answer
4k views

12.04 Server Multiple IP Addresses with Multiple Interfaces

I'm running Ubuntu 12.04 Server on VirtualBox. I'm trying to setup two interfaces with static IP addresses. If I only attach one network interface then eth0 works fine, but once I attach my second ...
2 votes
1 answer
167 views

SSHd not acknowledging TCP connection from public IP address

I am trying to enable SSH access to my home server via SSH from a public IP address. But the SSH server is not responding to requests from a public IP address. Connections from a local IP work fine. I ...
1 vote
0 answers
20 views

What is "ovs-testc"? How Do I Disable It?

I'd like to run an SDN application on my Ubuntu machine (ver 22.04.3 LTS). As I understand it, when the SDN runs, it needs to BIND to TCP 6653, the default port for OVS. But on my machine, the SDN ...
0 votes
1 answer
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can't connect to bluetooth device after updating to new version

i have recently updated ubuntu version this is my current versions Distributor ID: Ubuntu Description: Ubuntu 23.10 Release: 23.10 Codename: mantic the issue for me rn is that i cant connect to my ...
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Cannot receive UDP datagrams if I use an address OTHER than 0.0.0.0:<port> on second Ethernet interface on my computer board

I'm running Ubuntu 22.04 on a board with two wired Ethernet interfaces (call them LAN1 (192.168.1.101) and LAN2 (192.168.2.1)). Newbie to developing for Linux, and I'm using .NET 6 runtime for my ...
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15 views

Devilbox - error, "No Host DNS record found. " even after adding folder name in /etc/hosts/

I am using Devilbox and have been learning through documentation on how to work with it, I have created a folder inside /data/www/ inside devilbox folder and before that I have excluded the mention of ...
8 votes
1 answer
18k views

Virtual Machine Ubuntu 20.04 LTS : connect: Network is unreachable

I am new to linux and networking and today I have a "connect: Network is unreachable" when executing ping or sudo apt commands. I have seen some similar questions but still don't have a clue ...
2 votes
2 answers
37k views

ubuntu 20.04 server not responding to ping

My problem is the following: on the 192.168.1. * network I have 3 machines. I call them U1 (Ubuntu Desktop), US2 (Ubuntu Server), W1(Windows) and a router named R1 in 192.168.1.1. U1 makes and ...
4 votes
1 answer
25k views

how to setup a Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)

Bluetooth setup docs seem a bit dated; my device, but with a different chipset, is on the hardware support docs, however. thufir@mordor:~$ thufir@mordor:~$ hciconfig hci0: Type: BR/EDR Bus: USB ...
1 vote
0 answers
295 views

Interfaces do not come up automatically when ethernet is plugged in, 16.04

I have a minimal installation of 16.04 on a singleboard computer, the network interfaces are configured through the interfaces file (network manager is not installed). auto eth0 iface eth0 inet dhcp ...
3 votes
2 answers
3k views

Bluez daemon is not running

Sorry to ask this question again, I have browsed all the similar posts and tried a few of the suggestions without any luck. When I try to connect to the Bluetooth manager I get this result. Details ...
3 votes
2 answers
17k views

DNS cannot resolve hosts

I recently upgraded my ubuntu and suddenly lost DNS. By the looks of it, its related to https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1674532. But I cannot run the update to fix the issue ...
0 votes
1 answer
10k views

Opening UDP Ports

I'm trying to open a port which I believe I did but maybe It didn't work. I'm trying to run a server of Counter Strike 1.6 and its Online however Its not responding when I try to refresh data about ...
0 votes
1 answer
65 views

Wi-Fi driver problem

I installed Ubuntu yesterday (March 22, 2024) on an HP G62 laptop. Now I can't access the internet because I can't access Wi-Fi. The laptop's internal Wi-Fi is broken and I am using a local market Wi-...
3 votes
2 answers
12k views

Ubuntu 18.04 - No Wifi networks found

I have Ubuntu 18.04 Dual booting with Windows 10 on my HP-EliteBook-745-G2, and for some reason, I cannot seem to find WiFi networks through my WiFi adapter, but Ethernet works (however, Ethernet ...
0 votes
0 answers
31 views

Wifi stopped getting connected in Ubuntu 20.04

My Ubuntu 20.04 was working all fine, but all of a sudden I am not able to connect to my wifi as it is keeps on asking me for the wifi password again and again. I tried to remove the wifi password in ...
0 votes
0 answers
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Assistance Needed: Recovering Root Password and Accessing Firewall Settings on Ubuntu 20.04 Server

I am encountering issues with my Ubuntu 20.04 server running on Oracle, as I have forgotten the root password. Unfortunately, I am unable to access the GRUB menu to initiate password recovery. Could ...
4 votes
3 answers
6k views

Configure Brother HL-1212W wireless printer via Ubuntu

I've been able to configure my Brother HL-1212W to print via USB cable without much problem. The printer is not connected to the wireless network, but it is capable of it. I'd like to do the full ...
0 votes
0 answers
41 views

Ubuntu Has No Internet :/

Ubuntu Server 23.10 My server was working perfectly fine, until one day I woke up to it having no internet. The server has a static IP address, and I can use it locally, however when I try to run ping ...
-1 votes
0 answers
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Network Printers

Ubuntu 23.10 Using Cinnamon desktop. Local Wifi network printers keep appearing and reactivating themselves in 'Printers-Local Host'. They show up as a 'Printer installed' dialog box on my screen. In ...
1 vote
1 answer
78 views

Where does the configuraiton in /run/systemd/network come from in a fresh install of 22.04 server?

I have run the following sudo find / -type f -name "*.network" -not -path "/var/lib/docker/*" to show all the .network files on a fresh 22.04 server install. Aside from the ....
0 votes
1 answer
5k views

Internet can't be connected - "Disconnected - you are now offline"

I am a very new user of Ubuntu and booted my Lenovo 3000 n500 laptop with Ubuntu 14.04.4. Every time it's displaying "disconnected - you are offline". But the same file is used for my friend's PC and ...
0 votes
0 answers
26 views

driver=r8169 driverversion=6.5.0-21-generic not accepting I/G bit in MAC address assignment

I am trying to set a MAC address to my RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller, but the ID does not accept xy:xx:xx:xx when y is even. It seems the I/G bit (multicast) cannot be set. ...
5 votes
10 answers
19k views

Unable to connect with the hotspot created on ubuntu

I am using Ubuntu 22.04.1 LTS desktop. I want to share the ethernet connection via wifi hotspot on my laptop. After turning on the hotspot, I am not able to connect any device from the hotspot, it ...
3 votes
1 answer
5k views

How to get stream from IP camera on Ubuntu 20.04?

Im trying to connect my Hikvission camera(model: DS-2CD2043G0-I) to my laptop directly with Ethernet cable. I have connected the cam to POE switch and then connected ehternet cable from the uplink ...
4 votes
3 answers
9k views

I can't connect to VPN under Ubuntu, what is possible on Windows

I was provided with an access to the VPN server. All I got were server's IP, username and password. Under Windows connecting to the server was easy - I just had to type the information I received. ...
1 vote
2 answers
2k views

How can I install the driver for rtl8192eu USB 2.0?

I am using ubuntu-21.10-desktop-amd64 Please note that I don't have any networking capability at all in Linux. So for example, to install anything I need to use Windows 10 to download the archive etc. ...
1 vote
0 answers
40 views

When does ubuntu initiate a DHCP lease renewal?

After doing some research. I found out that some DHCP clients initiate a lease renew when 50% of the lease time has elapsed. And I need to know if this is valid for ubuntu 20 and later DHCP clients. I ...
0 votes
0 answers
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system-resolved and bind9 Ubuntu 22.04.4

I'm running a bind9. All requests are resolved correctly. After some times, i'm facing the following: From clients all requests are correctly answered. "dig", "nslookup" etc works ...
1 vote
0 answers
33 views

I am unable to see any wifi networks

Turning wifi on and connecting to hub not possible. NAME="Ubuntu" VERSION="20.04.1 LTS (Focal Fossa)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 20.04.1 LTS" Running ...
0 votes
0 answers
19 views

How to ping/connect to a KVM on another machine in the same lan?

I have 2 machines in my cluster, say M1 and M2. I have one machine installed with a VM (brought up by virt-install), say VM on M2. My M2 can ping the IP address of VM. My M1 and M2 can also ping each ...
-2 votes
0 answers
35 views

I need help with this school assignment [closed]

Basically i need to create 3 vbm instances for example ubuntu,windows and macOS need to put them in a server-client relationship(in the same laptop).Also need to complete all of the below request: ...
11 votes
4 answers
26k views

Wired network settings missing in Ubuntu Desktop 20.10

This seems to be a longstanding bug that has appeared in many releases. A fresh install of Ubuntu Desktop 20.10 does not show the Wired Network Settings. I only have Wireless internet access. Turning ...
-1 votes
0 answers
89 views

Ubuntu 22.04 LTS and kernel module 6.5.0-25-generic does not connect to any wifi network

I have linux ubuntu installed on my Lenovo Ideapad3, with Realtek network adapter. I connect to any wifi, since last Thursday. I tried as written in many blogs, one of them works. Which was to switch ...

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