Questions tagged [networking]

Managing and using network connectivity on a Ubuntu system

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Ubuntu 18.04 stopps resolving .local domains, but not always

I've been trying to format a Drobo to use with linux. While I was doing this ubuntu suddenly stopped resolving .local domains, breaking big parts of my configuration. I could fix this by just using ...
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Run Homebridge on crontab

I have installed homebridge on my Raspberry and want to run it on startup, so I added crontab -e @reboot homebridge & to the crontab file. But on reboot the PI always stops at the login form (...
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Setting up networking through ethernet port on laptop

I am trying to set things up on my laptop so I can connect to my router through Wifi and use the local ethernet port to connect devices in my home office through an ethernet hub, including an all-in-...
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How to make VPS more secure with UFW?

I have 3 VPS based on Ubuntu 18.04 server OS and would like to open particular ports on each servers. The ports, that I would like to open are: Then let's take a look on the environment: As you ...
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60 views

Only last NIC in netplan config is accessible

Server has 4 NICs and one bridge (irelevant for discussion) configured by netplan. After running netplan apply --debug I get following merged config: DEBUG:Merged config: network: bonds: {} ...
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need to download a “dpkg scsm7.4.2.8003_UbuntuXXX_x64.deb” for Ubuntu 18.04 LTS version. Thank you much

Where do I download a "dpkg scsm7.4.2.8003_UbuntuXXX_x64.deb" for Ubuntu 18.04 LTS version. Thank you much.
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Issues when connecting to network on Ubuntu 18.04.3

I recently installed Ubuntu 18.04.3 on my Dell Inspiron. At my school, usually there is a pop-up asking for your school username and password. It used to work just fine when I used Windows 10. However,...
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60 views

traceroute not working

traceroute --help bash: /usr/lib/command-not-found: /usr/bin/python3: bad interpreter: No such file or directory Trying to run this command but the error shows up. sudo apt-get install traceroute -y ...
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Usb thetering not working in ubuntu 16.04

Usb thetering not working to establish internet connection using usb data cable . Also the networking menu or option doesn't show up in upper right corner of tab menu option??
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Global proxy behind a corporate firewall

There is an issue I try to solve. One of my PC running Ubuntu 18.04 is behind the corporate firewall. My problem is, that there is not just 1 IP address to the outside. The firewall provides a script (...
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Setup ping reply

I have Ubuntu machine running on AWS cloud. System not replies to ping from Interet side. How to enable this? I have Enabled UDP port 7 in inbound rule, but this not helped. Content of /etc/ufw/...
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Can I use kernel version 5.2+ on Ubuntu 16.04?

The question is as the title says: Is it possible to use Kernel version 5.2+ on Ubuntu 16.04? From a quick search, I find multiple ways to do it on Ubuntu 18.04 and forward, but nothing regarding 16....
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Group Policy Objects (GPOs) for Linux

I have a windows server and different platform clients. I want to set up group/domain policy on my network. Is there any solution to implement GPO for Ubuntu client substitute of third party ...
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WiFi USB adapter with Linux drivers not detected on Ubuntu

This product. This repo. lsusb without the adapter plugged in: mmkstarr@sqirly-syllybus:~/computers$ lsusb Bus 001 Device 007: ID 25a7:fa23 Bus 001 Device 006: ID 1a40:0101 Terminus Technology ...
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Installing Ubuntu Server 18.04 on Intel board S500VSA

I am relatively a newbie level user on Ubuntu. I have a few laptops that run Ubuntu desktop and I was able to get them going (with some forum searching help). However, this time all my searches did ...
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server in own network reachabal but not over externel ip

ok i think i have to explain myself. Im running an old build of Ubuntu (18.04.3 lts) but i was to lazy to update. I am now trying to build a homeserver of this mac mini on which ubuntu is running. I ...
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59 views

No domain on LAN, local DNS fails

At the moment, I am using a router which has a domain name as part of its settings. Two days from now, I change ISPs, which means a router with no visible domain name in settings. In preparation for ...
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Ubuntu 18.04 no internet connection

I have internet connection problems using Ubuntu 18.04 on my laptop. It's a dual boot with Windows 10, no problem under Windows 10, same router, same router configuration, same laptop, but no internet ...
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93 views

iptables string match does not work whe the --to option is < 52

when I enter iptables rule which match string and the --to option is >= 52 example iptables -I FORWARD 1 -m string --string anypattern --algo bm --to 100 -j DROP The above works properly and ...
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133 views

Kubuntu can't connect to WIFI

First of all, I would like to say that I have searched and tried everything suggested and still having this problem. I am unable to connect to any wifi available, I have tried my home wifi and my ...
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28 views

block flow with iptables

To block packets containing some string we use the following iptables rule: iptables -I FORWARD 1 -p tcp --dport 80 -m string --string anypattern --algo bm -j DROP This will block the packet ...
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How to share one Network Interface's Traffic between several containers(LXC/LXD)

We want to share one Interface's traffic between several containers(LXC/LXD). The interface is Gigabit with no IP. It works for one LXC. I was thinking about making several sub_interface and ...
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No Option for Wireless Internet Connection Ubuntu 18.04 LTS [duplicate]

I recently installed Ubuntu 18.04 on my MacBook Pro, this is my first time using a Linux OS. I do not have an option to connect to wireless internet, though I can use a wired connection with an ...
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48 views

Strange output for netstat command

I'm getting a strange output for the netstat -tup. What I mean by strange is I never got this output before when nothing connected to the network/internet (connected to the network, but not using it, ...
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Firefox browser internet protocol leaks?

im using the mullvad vpn client on ubuntu 18.04. just wanted to ask a question in relation to browser internet protocol leaks-im using the mullvad client on ubuntu with the firefox web browser-is it ...
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Why use iptables-persistent?

What is the advantage of iptables-persistent over an init script? I checked the output of iptables-save, and there were a couple gorillion lines, from docker and others. What trouble might I run into ...
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Troubles Installing

I remember using multiple floppies and taking nearly a week with my young geekie son in the early 90s to install Linux, hardware and all. Off and on used many flavors past two decades or so. All I ...
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TP-LINK TW-WN821N works at half the Windows speed

THIS IS NOT A DUPLICATE Why is my WiFi dongle so slow? I have googled this many times. I can't bear this. I have tried a lot of the commands. A lot of them didn't work. I believe I turned 808.11n or ...
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54 views

Reverse proxy access via wireguard shows external IP

On my ubuntu server I run different services in docker behind an nginx reverse proxy. Some are accessible from the internet, some should only be accessible via wireguard. The acces via wireguard is ...
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110 views

Unable to see USB wifi

I recently upgraded Ubuntu from kernel 5.0.0-37 to 5.3.0-26 (x86_64). It seems coincident with this upgrade, my wifi USB dongle stopped working (Archer T4U). It normally has some flashing lights on ...
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23 views

Why doesn't Ubuntu Server come with wireless-tools package installed?

I am having to haul my giant case downstairs to the living room router when dad's at work not to bother him and lug through my cables bin to find an ethernet cable to temporarily use a wired ethernet ...
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ubuntu 18.04 LTS not recognizing intel wifi card 8260 on dell latitude E7470 laptop

My wifi was working up until today, when I could not turn on wifi and in the wifi settings window it says "wifi adapter not found". I've been looking at all answers to do with keywords "ubuntu wifi ...
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62 views

wi-fi adapter not found on Ubuntu 18.04

I know this (kinda) a repost, but all the other threads on here haven't helped me so far. I put a drive with an existing dual-boot setup of Ubuntu 18.04 and Windows 10 in a new laptop. The Wi-fi is ...
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Why is my isc-dhcp-server not handing out the router address to clients with reserved addresses?

I'm running isc-dhcp-server on Ubuntu 18.04. Clients without a DHCP reservation are able to get an IP address, subnet mask, default gateway and DNS servers from the pool no problem. As soon as I ...
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81 views

How to fix failing connection to SAMBA print share (Ubuntu 19.10)?

I have lately installed Ubuntu 19.10 and wanted to connect to the printing services on a local network, shared for linux users via SAMBA. While this worked flawlessly with 18.04/18.10, it's stopped to ...
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I cannot connect to the internet in my Xubuntu vm among other things

I'll go through with you the steps I took before my internet broke and explain to you what I've tried. I was trying to install ros melodic for use with gazebo and px4 because it wasn't running and ...
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40 views

Share Internet over Wif-Fi hotspot network

A Wi-Fi hotspot is created on computer C1. C1 is not connected to any other network. A computer C2 is connected to this Wi-Fi network and to Internet. Is there a way to configure C2 to share the ...
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Disabling IPV6 leads to default route being lost on reboot

I have a new dedicated server from Heztner. I am running Ubuntu 18.04.3 LTS (minimal). I have a problem which results in the default route being lost on reboot, killing all connectivity to the server....
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wpa_supplicant[907]: TDLS:Invalid frame

I'm investigating a system freeze and I came across the following in /var/log/syslog Jan 22 08:40:41 hostname wpa_supplicant[907]: message repeated 42 times: [ TDLS: Invalid frame - payloadtype=1 ...
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59 views

Xiaomi RedmiBook 14" Ryzen Edition broken WiFi

Running Linux RedmiBook 5.3.0-26-generic #28-Ubuntu SMP Wed Dec 18 05:37:46 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux lspci reports the device 01:00.0 Network controller: Qualcomm Atheros QCA6174 ...
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UFW blocking even after adding allow rule

I'm running 16.04 LTS for my Unifi controller and have always used UFW. I've always had UFW enabled and it's always worked. Lately, it seems that some rules don't even work anymore - can't even ...
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445 views

18.04 with VirtualBox 6: Need Help installing alfa awus036ach USB attached WiFi

I am trying to install the USB-attached alfa awus036ach WiFi adapter to look at my home network with Kali as a virtual machine. Very new to Ubuntu, Linux, and command line. I installed Ubuntu 18.04, ...
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Iptables help - How to forward Multicast UDP to LAN interface?

I'm trying to forward incoming multicast traffic to my LAN. This is the packet I can see coming into the WAN interface. 192.168.60.5.50258 > 234.5.6.7.8910: UDP, length 1000 Wan - eth0.2 Lan - ...
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118 views

Windows 10 share no access

Attempting to move media from Windows 10 to Ubuntu folder on the same network. I created a share user name/password and can log into the server, but have no access to the folder from Windows. Image ...
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How to configure cups server automatically based on network

I bring my laptop along between different locations and networks, and in order to print, I have a separate .cups/client.conf (specifying the ServerName and user) for each network, with client.conf ...
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29 views

why does gnome wifi hotspot window keep popping up?

I have Ubuntu18 LTS running on an old iMac. I have the wifi hardware disabled and my router doesn't have a portal. For some reason hotspot login keeps opening and closing and my network icon changes ...
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49 views

USB Wifi Adapter FayTun stopped working

my wifi adapter somehow stopped working (together with my graphics card) on my Ubuntu 18.04 machine. After reinstalling my Nvidia driver my graphics are working again, thats not a problem. But somehow ...
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network connection disruppted while installing octave

I was installing Octave on Ubuntu 19.10 based on instructions available here http://ubuntuhandbook.org/index.php/2019/07/gnu-octave-install-snap-ubuntu/ so after doing sudo snap install --beta ...
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46 views

Bridging two interfaces together, forward traffic

I'm currently trying to create a setup that forwards traffic through a Ubuntu server to a switch, which then multiple servers will be connected to (each assigned an individual IP(s)) The Ubuntu server ...
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31 views

Thunderbird fails to connect to all accounts

I have an existing Thunderbird profile that I use across several devices (keeping in sync the directory). Today I installed Ubuntu 19.10 and Thunderbird 68.4.1. I imported the existing profile with no ...