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Linux Mastering Development Ubuntu

Ubuntu 18.04 detects wired connection and has access to LAN connections, but can’t reach the internet

First off, I’m very new with Ubuntu, this is a work computer I’m trying to setup. Any help will be greatly appreciated! It’s a prebuilt that doesn’t have a wifi card, but two ethernet ports (dual xeon machine for scientific computing purposes). When I plug my ethernet cable in, which works for other windows machines, […]

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User Help

CentOS not finding wifi adapter

I installed CentOS on a Lenovo yoga laptop a few days ago, but I cannot get the wifi to work. I’ve tried lots of things following suggestions from replies to several questions on different sites. NetworkManager-wifi is installed (and always was). Below are some of the commands people usually ask for, I really don’t know […]

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Mastering Development System & Network

Random “Connection resets by peer” with redis-benchmark

I’ve got several linux hosts in office network. When I run Redis server on one of them, redis clients receive random errors “Connection reset by peer”. We’ve noticed these errors with our own clients using hiredis. However, the same error is reproduced with the utility redis-benchmark included in the Redis package. This utility simulates several […]

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Linux Mastering Development Ubuntu

Wifi issues with Ubuntu 18.04

I’m running Ubuntu 18.04 on a Lenovo laptop, and I’m having lots of issues with my wifi. Originally, I installed Wicd, that made the connection better, but caused issues by making my wpa_supplicant fail. Now I’m back on network manager, and when I boot up, I instantaneously get good internet speeds, but then it’s almost […]

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Linux Mastering Development

Route eth0 to tun0 (OpenVPN) and leave wlan0 unaffected

I currently have a Raspberry Pi Model B+ v1.2 (and I am planning to get the Raspberry Pi 4 after I sort out these issues). I have the network interface eth0 connected to my router through an Ethernet cable, and I have wlan0 connected to the same router through Wi-Fi. I am planning on using […]

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Linux Mastering Development Ubuntu

System Freeze UFW OPENVPN Network Timeouts

Problem My computer randomly freezes (does not accept any input anymore, mouse pointer is frozen) or shuts down (not completely, it “hangs” so that even pushing the reset button won’t restart, I then have to press the power button for a few seconds to turn it off completely). System Hardware I’m using a wifi USB […]

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Linux Mastering Development Ubuntu

PLEASE HELP: wlan0 no longer available after docker install

After using the following commands to install docker: [user@localhost ~]$ curl -fsSL https://get.docker.com -o get-docker.sh [user@localhost ~]$ sudo sh get-docker.sh [user@localhost ~]$ sudo usermod -aG docker $USER and rebooting, my wlan0 device is no longer available (and was replaced by docker0). I disabled the docker service systemctl disable docker) and rebooted again. I now have […]

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Mastering Development System & Network

OpenVPN connected client cannot connect to VPN servers network (bridge mode)

I have installed an OpenVPN server on Ubuntu server (192.168.178.30). The connection works well, OpenVPN is in bridged mode – I got IP address 192.168.178.220 as connected client. But when I try to ping the VPN server itself or other devices in 192.168.178.0/24 (suche as the FritzBox at 192.168.178.1) nothing works. Also I do not […]

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Mastering Development System & Network

Ubuntu after bridging network no internet

I am running an Ubuntu server with OpenVPN and apache on it (192.168.178.30). The FritzBox (Router) is 192.168.178.1. OpenVPN is is bridge mode. When I start the bridge using the OpenVPN shell script (bee below) ifconfig looks like this and I have no internet connection anymore: br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.178.30 netmask 255.255.255.0 broadcast […]

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Mastering Development System & Network

ifconfig not showing wlan0

Not able to see wlan0 on executing the command ifconfig: The output on executing the command ifconfig is eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.0.2.15 netmask 255.255.255.0 broadcast 10.0.2.255 inet6 fe80::a00:27ff:fe1f:3076 prefixlen 64 scopeid 0x20<link> ether 08:00:27:1f:30:76 txqueuelen 1000 (Ethernet) RX packets 6 bytes 1430 (1.3 KiB) RX errors 0 dropped 0 overruns 0 frame 0 […]