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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How to fix the "Connection failed with error: Failed sending banner ....." for ssh?
At times when the remote device is behind a VPN or is in local network, this error shows up:
Connection failed with error: "Failed sending banner to ....@..........:22"
This shows up infrequently ...
CommunityBot
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How to match the --out-interface to the same --in-interface in iptables
The system have multiple interfaces: eth0, eth1, eth2, ... br0, br1, br2, ...etc.
The following rule will allow packets from "br0" to "br0":
iptables -A FORWARD -i br0 -o br0 -j ...
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Cannot establish HTTP connection with VPS although ufw is allowing outside traffic
Here is the output of sudo ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip
To Action ...
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Ubuntu WiFi hotspot MIA
I have a fresh Ubuntu 24.04.4 with a USB Wifi dongle from BrosTrend (AC1L), the most Linux friendly I can find. This is a minimal desktop version, but I initially turned off X/GNOME as it was mainly ...
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IpVanish VPN failed to connect
I am trying to install IpVanish on Ubuntu 23.10, but I get connection failure every time, the activation of the network connection has failed
VPN settings:
IPV6 settings:
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2
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TP-Link AC600 Archer T2U Plus driver for Ubuntu 20.04
I am looking for a driver for the TP-Link AC600 Archer T2U Plus, on Uubuntu 20.04 (kernel version 5.11.0-40-generic).
$ lsusb
Bus 005 Device 002: ID 2357:0120 TP-Link 802.11ac WLAN Adapter
$ inxi -N |...
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Slow speed Ethernet issue on Ubuntu 24.04
I recently changed my system to Ubuntu from Windows and I use my mobile and USB ethernet to connect, I used to get 500+ mbps on Windows by using USB tethering, but on Ubuntu 24.04 I am getting only 4 ...
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Force rescan of the pci device which was wrongly detected by os
I am using ubuntu 14.04.3 , kernel version 3.13.0-67 with a Atheros Wifi Card AR93xx .Many of the times ,no wireless detected on system boot. Below is the problem I detected .
The wireless card ...
CommunityBot
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Lubuntu 17.04 will not connect to WiFi (no error message displayed)
I just installed Lubuntu 17.04. It did not recognise the WiFi card I had in the MB, so I took a TP-Link WN722N USB stick. The system immediately recognised the USB WiFi stick and offered networks to ...
CommunityBot
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Ubuntu 20.04.6 (kernel 5.4.0) - Wi-Fi Driver Intel AX211
Looking for guidance/documentation I can follow, to get wifi firmware/drivers built/backported and installed for my older kernel version.
Trying to get a very new card:
Internal Wi-Fi Antenna Intel Wi-...
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Unabe to do KVM networking over WiFi Interface
Running Ubuntu Server 24.04. I am trying to connect a Debian VM (KVM) to be accessible through my Home Network. Host to VM communication is not necessary.
On the host Machin there is a Lan port that I ...
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Bluetooth Connecting/Disconnecting
I'm running Ubuntu 24.04. I'm having an issue where both my Xbox controller and Pixel Buds are connecting and disconnecting about every 30-60 seconds. No audio ever comes through the buds, and the ...
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Why does host and bridge get an IP but not the virtual machine?
I'm struggling to connect my KVM virtual machine to the local network.
$ brctl show br0
bridge name bridge id STP enabled interfaces
br0 8000.4c5262097e59 yes ...
CommunityBot
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Ethernet not working on Ubuntu through the main router
I set up a PC about a month ago and put Ubuntu on it to host a Minecraft server. It's been running excellently, but one night I opened my router's webpage and opened the port that Minecraft uses and ...
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1
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How to join windows client to ubuntu OpenLDAP domain server
I've configured an OpenLDAP server on my Ubuntu 12.04 server. I also configured a DNS server for domain support. My slapd service is running perfectly and I can see it with my LDAP browser. Using ...
CommunityBot
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DNS problem for only some devices on our network
I'm running into a DNS issue in our office's network. We had a power outage and when the router rebooted a few of the servers on our network started to have problems connecting to other devices on the ...
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How to start and deploy DFX 0.9.3 in VSCode?
This is the error I get:
Error:cannot parse provider URL
Caused by:invalid port number.
I have tried almost everything, but I could not find any solution.
dfx replica --port,
dfx bootstrap --port,
...
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1
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Wifi speed significantly slower on ubuntu 22.04 than on windows
My Wifi speed is significantly lower on Ubuntu 22.04 than on windows. Iv'e tried all previous solutions as suggested in these: Wifi is slow and unstable on ubuntu 20.04 dual boot (DELL XPS-L502X)
wifi ...
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Network/DNS issues on 22.04.4
Im facing strange issue on virtual Ubuntu 22.04.4 server (VM). Few days ago it started to fail during basic network communication. I can ping to IP adresses but when I try ping by name it returns that ...
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connecting two linux machines with ethernet cable error
I have two running machines That I want to communicate between with an ethernet cable.
machine A)
ethtool -i eth2
driver: nvethernet
version: 5.10.192-tegra
firmware-version:
expansion-rom-version:
...
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2
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How do I permanently delete networked printers?
I'm running Ubuntu 15.10 with the latest updates as of 2 Feb 2016.
I use my laptop on my home Wi-Fi network and at at work on our school's Wi-Fi network. I have a Wi-Fi printer at home and a USB ...
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Enable mobile broadband not working
I'm using an EVDO usb Modem on 12.04. It works perfectly fine for few times. But now on wards when ever I try to connect it shows not enabled in status . I tried to enable it by ticking "Enable Mobile ...
CommunityBot
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4
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NordVPN prevents printing
When NordVPN is installed on Ubuntu Linux, and I try to print using CUPS, I find that printing to my networked laser printer always fails.
Disabling NordVPN:
$ nordvpn disable
Allows me to locate ...
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Failed to start Raise network interfaces, after upgrading to Ubuntu 18.04.1 LTS
ifup gets stuck, and it takes a long time at boot up and down.
me@K501L:~$ systemctl status networking.service
● networking.service - Raise network interfaces
Loaded: loaded (/lib/systemd/system/...
CommunityBot
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3
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Ubuntu 18.04: Two wireless interfaces
I just install Ubuntu 18.04 on my laptop.
The laptop already has a wireless interface, when i try to plug in a USB wireless interface and try to turnoff one of them the other will stop too.
And i can'...
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Is it possible to combine the bandwidth of wireless and wired NICs?
My server (using Ubuntu server 22.04 LTS) has a 100M wireless and wired network card, and I'm using it to run a website (pure IPv6).
Both NICs are currently connected to the same router, is it ...
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rtl8822be on 18.04.1 (New Install on Lenovo Legion y530)
Same problem with Realtek Device b822 as discussed in rtl8723ae unstable on Ubuntu 14.04 and New install - no network devices available - Realtek Device b822. Tried installing rtl8822be with and ...
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I cannot connect to the Internet (Ubuntu 24.04 LTS)
My computer won't connect to the Internet.
I installed Ubuntu on a PC with Windows 10, I replaced Windows 10 with Ubuntu during the installation. When I was on Windows 10, the internet still worked as ...
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How can I refresh resolv.conf after changing the resolv options in the interfaces file?
After bringing up a dhcp controlled instance in AWS I have made changes to the /etc/network/interfaces file for custom nameserver and DNS search strings:
auto lo
auto eth0
iface lo inet loopback
dns-...
CommunityBot
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After installing Ubuntu 22.04, can't see home router wifi radio, even though adapter works fine!
My laptop works fine with other wifi in other places (even after I installed Ubuntu, 22.04); But somehow it lost vision of my Home Router signal! I run both Windows 10 and Ubuntu on it and both OS don'...
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Kubuntu 22.04 wlp2s0 wifi connected, but doesn't exist in "connections" app
Running kubuntu 22.04 on older Dell Inspiron P75F.
Wifi connects as wlp2s0 and internet is accessible. However, the device is missing from the "connections" app and the "network" ...
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Ubuntu 18.04 wifi 'Authentication required by wireless network' following software update
Immediately following a recent software update I'm no longer able to connect to wifi. Connection attempts receive the message 'Authentication required by wireless network'. The authentication details ...
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Installing Broadcom Wireless Drivers
I'm having serious problems installing the Broadcom drivers for Ubuntu. It worked perfectly on my previous version, but now, it is impossible.
What are the steps to install Broadcom wireless drivers ...
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Did I bloat my network devices? <nmcli d s | grep ^$IFNAME> Help
I'm a Linux noob so bear with me. I'm in the process of trying to figure out how to use my device as a WiFi extender using NetworkManager to create a persistent hotspot. I tried out multiple methods ...
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1
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Network file configuration issue [closed]
My version is 18.04 after configuring static ip in yaml file, i am getting below error.
invalid yaml mapping values are not allowed in this context
I need help on configuring Static file.
Regards
...
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System network connection
I tried installing a vpn (hide.me) then uninstalled it since I was not able to use it. After uninstalling the vpn, my Ubuntu was no longer connecting to the internet. It shows that the internet is ...
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1
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ThinkPad T14s Gen 5: How to use / unlock the RM520N-GL modem
I've recently been struggling with the problem written in the title. Lenovo sells this Laptop with official Linux support and also allows you to buy this modem for an additional ~$300. However, it ...
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How to get L2TP protocol on *ubuntu system while being offline?
My ISP uses L2TP to provide Internet access. So I need L2TP to connect. On the other hand, I need access to install L2TP through that strange Linux online installing system. There is no L2TP out of ...
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Correct way to apply WiFi mac address randomization
I wanted to randomize my mac address on every boot just like in Windows 10. During my quest for that I tried the following -
According to this post, starting from NetworkManager 1.4.1+ we can do mac ...
CommunityBot
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How to protect from ARP spoofing
In my campus, some people they are using netcut in Windows and they are blocking us not to use Internet.
Since I am a Ubuntu user, I can't install neither nutcut nor netcut-defender to protect and ...
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Low Signal Strength of Bluetooth in Ubuntu 18.04
I have installed Ubuntu 18.04 LTS in my HP 15 laptop. Initially there were no wifi drivers, so I installed the rtlwifi_new after reading some threads on internet (worked like a charm) but there is a ...
CommunityBot
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Error showing :Ethernet Cable unplugged in Ubuntu 14.04?
I have been using dual boot OS one is windows 10 and another Os is Ubuntu 14.04. in windows10 ethernet working perfectly fine.but when I using ubuntu it showing ethernet cable is unplugged. I have ...
CommunityBot
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No wifi driver for RT5370 Wireless Adapter in 22.04
Ubuntu 22.04 on Orange Pi 5 board. There is no wireless interface after I insert WiFi USB adapter. The output:
$ lsusb
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device ...
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1
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No wifi on Asus Vivobook (Kubuntu 24.04)
New to Kubuntu as of yesterday, on an Asus Vivobook laptop. I have a USB wifi dongle that is recognized and allows me to connect to wifi, and after the first time I ran apt update & apt upgrade ...
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Network/VPN/Browser problem
I have Ubuntu 22.04.4 LTS 64 bit, and I know nothing about computers, basically all I can do is deleting cookies in browser. I bought my computer from a friend who said Ubuntu was very simple, but ...
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Ubuntu 22.04 update disconnects Windows 11 network services
I'm running a Ubuntu 22.04-based file server (Samba to Windows 11 clients). Several weeks ago I ran apt upgrade. My ssh connection dropped part way through the upgrade. From that point I can get a ...
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5GHZ wifi is not showing on Ubuntu 18.04
I am trying to find my 5Ghz ssid and then I will try to connect it but it's not showing up.
My lspci |grep -i net output is
bash03:00.0 Network controller: Broadcom Limited BCM43142 802.11b/g/n (...
CommunityBot
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6to4 tunnel not working on ubuntu servers
I have two servers (both ubuntu 22.04), one doesn't have a public IPv6.
I'm trying to create a local connection between them using 6to4 tunnel (they have eachothers v4 ping).
I've created /etc/netplan/...
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Ubuntu MX records
I am little confused about MX records.
At least I think that is the problem, I followed a lot of guides about how to setup postfix, postfixadmin, dovecot on my VPS with Ubuntu 16.04,
but I had no luck ...
CommunityBot
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Is there a way to keep wifi on during sleep mode?
I'm using Ubuntu 24.04, i have switched off the power saving mode of WiFi, but still during sleep mode it gets disconnected first then during login it gets connected. I want the WiFi to not get ...
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